Warehousing: I have no clue to a percentage of warehoused domains but I know it happens. Tucows even admitted it on my blog “I know you don’t like that we’re allowed to select expiring names for the Tucows Portfolio rather than letting them all go to auction or drop but that seems to be something we have to agree to disagree about.” ~ Ken Schafer (1st comment) http://www.dotweekly.com/could-you-explain-tucows
Yes, I know, it seems backwards that you’d have to compete in an auction for a domain name that may never be caught. Other people feel the same way and many don’t compete as a result of that. But that’s the way the drop catching service was set up. Who knows, it may mean less competition for you since others do not like that model, which benefits the company rather than the user.
Regarding my statement above, “Any domain name that reaches expired status and is not renewed by the owner will be auctioned by an auction service.”–it did overstretch. I’ve modified it to be: “A domain name that reaches expired status and is not renewed by the owner will be listed at an auction service (see FAQ for exception to this rule).” Then I added a FAQ to clarify. Please check my thinking:
Expired domains with page rank, Alexa, TF, CF, Backlinks, DA, PA, RD, etc. are of much importance. It is because search engine values those expired domains because of their pre-built matrices. It can take you months to build that trust and then it will be of the value that you want. So, what if you can find expired domains with authority links like expired domains with CNN links, expired domains with Wikipedia links, expired domains with Huffington post links, etc. This kind of expired domains will provide you some great juice for your money website.
While getting a new domain name will give your site a clean slate and allow you to start a fresh marketing campaign, you may not be aware of the fact that some expired domains come with a high Page Rank value. A company that buys such a domain will not have to work so hard on website promotion and backlink building techniques. Thanks for updating this really informative post!
The first is the link profile I and actually took this example carbondsystems.com because it looked like a pretty good choice. It’s from 2003. It has some links, some age and it’s in DMAS and looked at the link profile in DMAS. So, you just copy and paste the domain,  the home page it to here, click on the search links button and this will show you all the links to that site.

Referring domains for anchor phrases usually reveals similar information. What you really want to look out for is whether or not the site has been picked up by a spammer in the past. A lot of times these expired domains were dropped, picked up by a website owner who then tried to rank it for keywords like Viagra, Cialis and whatever. You obviously don’t want that kind of domain.
If you are pursuing option 1, then you will want to use an automated service for the reasons mentioned in the article. Follow the process in the article to see which registrar the domain name is located at. If it’s at a Auction House like GoDaddy, NameJet or SnapNames, I believe they publicly share if there is a backorder on a domain name but not who placed that backorder. (Any interest in a domain name may be enough for someone else to place a backorder, thereby driving interest in the domain name that may be visible to the registrant.) So if the domain is at a registrar partnered with one of these companies, then you’ll have to monitor it manually (via calendar entries based on the whois expiration data) to maintain your distance.
Sometimes people purchase domains that they plan to build a website on or sell in the future, but it just doesn’t end up happening. If an individual decides that it is no longer worth the yearly investment of keeping the domain in their account, they may choose to let it expire. Or, someone might just forget to renew the domain before the expiration date. If this happens, it’s a great chance for other domain investors to score rare domain names that are pending delete. Spending time perusing the list of recently dropped domains can be a worthwhile way to find high quality domains.
i had a backorder for a domian that was registered at godaddy. The backorder of the domain says the domain expires feb 23, 2015. However, when i check the whois on different websites, it now says the domain is registered through feb 2016. However, GODADDY back ordering still has the domain with the expiration date of feb 23, 2015. Why would they be showing 2 different dates? The domain is not even in an auction, so the 2016 seems like the new correct date?
However, what do you think about buying expired high PR domains and creating local directories, business reivew, and event calendar sites that actually provide a value to the community? Then include a sponsored link from local business that is trying to rank? Do you think a method like that is a. morally soluble and b. viable long-term because it creates value?
If you buy keyword specific domains, you're really buying the type in traffic.  I use the URL builder and redirect through that URL so you can see how much traffic your getting from the keyword domain.  There seems to be no rythme or reason to what keyword domains deliver traffic and what don't.  By tracking traffic with the Google URL builder you get a feel for what names are giving you traffic and which are not. ie. the plural, the singular, two words, three words, the possessive, etc.

What about option #4 - Redirect your existing domain to the old domain? I bought an old domain that is 100% relevant to my current domain but currently has with very little content. It did have more content fours years ago. The old domain is 13 years old, pr=3, while my current is 7 months old pr=1 and a decent amount of content. The old domain I purchased was not expired though and I do not know if this makes a difference. What are the pros and cons of option #4? Am I correct to think that option #1 would result in no benefit from the old domain's age value and if so why is it not listed as a con, a MAJOR one. Its hard to believe that a 301 using option 1 would give my existing domain 13 years credit but I'll take it if it does.
See https://www.domainsherpa.com/domain-name-dictionary/life-cycle-of-a-typical-gtld-domain-name/. They start it in auction listings after it expires and before pending delete. I don’t know the exact dates, but if you monitor it you’ll see it go from auction, to closeout, to drop. You’ll need an auctions.godaddy.com account (I believe $5 per year) to bid and buy.
Answer: Many auction sites will allow you to backorder the domain name for free. Follow the process above to find the domain name registrar and auction partner site. Then sign up for an account at the auction partner site and enter a backorder. But remember, the domain name may transfer to another registrar at some point so refer to Step 1 above periodically.
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Here's a test I have in process.  I bought an old $5 closeout domain from Godaddy TDname expired auction.  I put a quick minisite up and linked to it with a crazy anchor text phrase.  The domain is ranking for that crazy term now.  It's gone through one pagerank update and I'm waiting for a second to come.  Then I'll redirect the domain to another minisite.  I suspect the second site won't rank for the anhor text, but we'll see.  
To get the most from GoDaddy Auctions, you should first decide on the way you want to evaluate the domains. Domainers tend to look at the words in the domain name, while SEOs care about the backlink equity. If you are a domainer, you should look at Estibot, Domain Index or Valuate scores. If you are an SEO, you should look at the Ahrefs, Moz and Majestic metrics to gauge the value of the backlinks. Once you have figured this out, you should look at these numbers for every domain you find on GoDaddy Auctions. Do not be afraid of bidding on the Closeout auctions, as you can get good domains for cheap.