Here's an old post on search engine roundtable that claims google's policy is to discount previous backlink juice when a domain changes ownership.  I'm not convinced whether this is actually true or something Google says to discourage excessive domain buying / 301 redirecting for SEO benefit.  The comments above seem to give varying opinions on this matter. Would be great to get to the bottom of that one!
If you buy a domain from a 3rd party, the backlinks are valuable.  I always wait a few months before redirecting, so just set up a quick minisite until two page rank updates have passed and then go ahead and 301 redirect.  However, it seems that you'll get the link juice from the back links, the anchor text is ignored by Google.   Buying a domain at Godaddy TDName expired auctions, seem to not count as a dropped domain if you immediately set up a mini-site.
The great thing about this is that it’s kind of like a metasearch engine for all the places that you can find expired domains around the web. First, let’s look at deleted domains. Okay? To do that, you go click on the deleted domains button here and then click on any top level domain that you want to get. I prefer .com because it’s obviously the most common top level domain.
The third option is the one that's the most time consuming but also has its benefits. It's like having a successful restaurant and buying another restaurant and operating them simultaneously. They're not the exact same restaurant, but both are popular in their own right and make you money. The same goes for Option #3. You could update the content on the old domain and sell the same products that you're selling on your current site. If you can get both sites to rank alongside each other in the SERPs, you're increasing your conversion chances and sales potential.
For example: If the domain name DomainSherpa.com is registered with Moniker (the registrar) and the domain name reaches expired status, within a few days of expiring the domain name will be listed at SnapNames.com (auction house partner to Moniker). Domain names are exclusive to one auction service, as an auction cannot take place at two locations.
Now a lot of time, you'll search for things and you'll think you're getting niche website's back, but actually, in fact, because of Google's shift towards big authority websites, you'll get things like Amazon listings. So if you don't want to end up crawling those big authority websites - and you want just the smaller ones, then you can make sure that the website, you'll crawl from the search engine results, is relevant by putting in a metadata requirement here. So any results that come back from the scrape of Google for any of these search terms, here you can say that they must contain one of these things, so what you can do is you can just put that your search terms in there back into there into the metadata requirement. So then, when a result comes back from google, it will loop through these line, separated terms and it'll say this is a homepage metadata, so the title, the keyword, the description, does it contain these?
Once you get to this point you know there have been DMAS listed. They have a number of domains linking to them and according to the way back machine which is WBY, you can see their site age. So, if you want to go with an older site you can see right here whether or not this is a site that you might be interested in, but before pulling the trigger you do want to check two things.
Domain Hunter Gatherer is a specialized software that helps internet marketers to easily find expired domains quickly and efficiently. First, you can use it to crawl multiple domain auction sites. You can easily monitor many different domain exchanges so you can scoop up the latest and greatest dropped domains. Secondly, you can use Domain Hunter Gatherer to crawl Web 2.0 sites. Now, you may be thinking, “I'm looking for drop domains here, what do Web 2.0 sites have to do with my search?” Well, you would be overlooking one of the best ways to add value to your private blog network. While you don't legally own your Web 2.0 site, you can use your accounts to redirect the links to your target sites. The best part is that many people who build up nice looking and high goodwill Web 2.0 pages end up abandoning them. Many Web 2.0 platforms enable people to re-register or claim abandoned Web 2.0 accounts. By using Domain Hunter Gatherer, you can find these accounts and filter them by niche as well as quality indicators and then redirect their links to your target sites. Your private blog network goes up in value because of a more diverse backlink footprint.

Today, the story is different. Domain name registrars realized that they could auction expired domain names to the highest bidder and generate additional revenue. If no one wanted the domain names in an auction, the domains would then drop and become available for anyone to register. Much of the time, however, domain names are successfully auctioned.
Domain Hunter Gatherer gives you a lot of options when it comes to getting a starting point for your drop domain search. This amazing tool also makes filtering drop domains so much easier. You have to understand that the vast majority of drop domains out there are complete junk. You have no business buying them. Unfortunately, if you don’t know how to filter correctly, most of these domains would look very attractive. You end up wasting your money on domain names that do not recoup the dollars you invested in them. Domain Hunter Gatherer makes filtering so much easier. It incorporates Moz and Majestic API support without requiring you to have an account on those services*. It quickly lets you know how many social media mentions a particular domain has, it lists out the number of backlinks that the domain used to have, and so on down the line. It's a very fast piece of software because it is multi-threaded. Finally, once you've identified certain domains you'd like to track, you can save them very easily. If you are looking to take your online income to the next level, you should definitely get your copy of the Domain Hunter Gatherer today. It will definitely make your life easier.
What DomCop does for you, is show you a list of all these domains along with important metrics for every domain. These metrics, along with our powerful filtering and sorting capabilities, will help reduce the size of the daily list from 200,000+ to just a handful of the very best domains. What would take you hours, will now literally take you seconds to do.
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