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 your domain name was in fact stolen from you, please go file a police report as soon as possible. If, instead, you allowed your domain name to expire through carelessness or ignorance, then you’ve learned a valuable lesson: domains have value. I’m not saying this to be a jerk, I’m saying this because words matter and saying something was “stolen” when in fact it was allowed to expire is not truth. I’m happy to share my knowledge as clearly as possible for others to benefit from, and all I ask is that others do the same.
Hi Kulwant, these are great tips as usual. I particularly like the way to tell us to check the google pagerank in case the domain has been banned – that could lower the usefulness of the domain quite a bit. One thing though, don’t you think that buying domains is sometimes immoral? Like sometimes you accidentally buy a domain of somebody elses website who forgot to renew.

I want to purchase a domain name that is to expire very soon. After looking it up on Whois, the owner is revealed to be 1 and 1, which doesn’t have a designated auction house based on your chart above. How should I go about trying to buy this? Because I don’t know if it will go to auction, and if it does, which auction house I should look at. It is set to expire soon: 2015-09-21
If you really don’t want to spend anything at all for your domain, that’s okay too. There are lots of ways you can get a free domain name for your website How to Get a Free Domain Name for Your Website How to Get a Free Domain Name for Your Website Why pay for a domain name when you can get a free domain name with your website? Read More . In the end, a domain name is really only a small part of your site. Really, the success of a site depends largely upon what you decide to do with it.
2) prerelease auctions.  These are domains where the auction venue has contracted with the registrar, like Fabulous or Moniker, to auction off non-renewed domains.  Just before a domain enters the pending delete process, it goes to a private auction to any person who has backordered the name.  Some people feel that back links on these type of auctions still provide a SEO benifit. My testing indicates that there is zero SEO benifit when these domains are redirected into another site.  So if you get a domain with "pink squirels" in a lot of achor text to a domain and then point it at your domain, you don't rank for "pink squirels"
If your domain name was in fact stolen from you, please go file a police report as soon as possible. If, instead, you allowed your domain name to expire through carelessness or ignorance, then you’ve learned a valuable lesson: domains have value. I’m not saying this to be a jerk, I’m saying this because words matter and saying something was “stolen” when in fact it was allowed to expire is not truth. I’m happy to share my knowledge as clearly as possible for others to benefit from, and all I ask is that others do the same.
The other way you could profit off expired domain names is redirecting the traffic to your affiliate link. For illustration, if you have an affiliate link that sells beauty products, and the expired domain name was mentioned or ranked in a high authority website for terms related to beauty products you can redirect the traffic there to make sales. One sale is enough to make you a decent profit.
If it contains any of those, then I am going to crawl it. Otherwise, I'm not going to because it's probably just something like an Amazon listing. Okay lets move on to the endless cruel. So this is the endless crawl. Basically, here you put your seed websites, one will do if it's a big website, because there's probably loads of domains on it. If it's a tiny, tiny a website, then you might want to stick a few more in so, as I was saying before, it will crawl on all the pages on these websites and then for each external domain that it finds on that website. It will check whether it's expired if it's not expired, it'll try and crawl it and then it will start the loop again, it'll try and take all the domains from there check that they are expired.
The whitelist filter for wanted characters is now split into three filters. The old whitelist is now named whitelist (only). When used, the domain has to consist only of the defined characters or numbers. No other characters are allowed. The new whitelist (any) filter finds domains that have at least one of the defined characters or numbers. The new whitelist (all) filter finds domains that have all defined characters or numbers at least once.
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