Domain hunger

Yesterday I found web site providing soon-to-delete domains. I thought these days no one would register this "crap", moreover there is a rumour that Google drop PR for domain as soon as it expires. Anyway, I loaded the list of domains in special software, allowing to check domain availability and decided to check them from time to time during the day. What do you think had happend? All domains were registered immediately after they deleted! There were about 20 or 30 domains. It seems that during this year domain hunger has ever increased!

I need to say that those domains had a non-zero PR and had some backlinks. But I know that you can buy a PR5 link for $30 per year, and it doesn't make a sense to purchase a domain and hope that it will maintain its 2.5 PR without any good backlinks. Perhaps the buyers desire to build and develop the domain, but it should definitely cost more than $30. So this "domain hunger" is a real mystery for me.

Here are the links I used:
Expired Domain Lists
Domain Name Checker - Software Tool