MarkWW- You must read some articles before commenting the second line..Once a domain gets deleted form a registry server .. Its flushed out with 0 stats..Backlinks, Visitors are secondary...
Well everyone must know that if a domain gets deleted. Its queued for stats reset that takes time. Secondly always try to grab the domain on the same registrar instead of another.. And always looks the number of backlinks, google indexed pages and CPC value instead of PR status.. PR just represents the levels of page ranking on the basis of other factors like daily unique visits, backlinks and other stuff..
You need to toss your articles out the fukin window. I have networks of expired domains and auction domains and 90% of what you posted is pure BS. I have websites with 2 frickin backlinks that are PR3 domains and have been from over a year through many Google PR updates. I also have websites with over 100,000 backlinks that Google won't index a single page let alone give it PR.
Purchase a couple thousand domains from drops and auctions and come back here next year and tell us what you've learned.
You'll learn PR only comes from backlinks. Has no consideration of anything except backlink quality from other sites.
You'll learn your idea of "flushing" is not a process by Registrars or Google, it's a result of a domain going offline for a length of time and search engines finding page not displayed repeatedly.
You'll learn any domain with age, PR or considerable backlinks is caught when it expires and renewed by Registrars to list to auctions. They're allowed a grace period where they can get full redemption for the renewals and some Registrars will exercise this renewal purchase and redemption several times keeping domains listed on their auction sites until they're sure nobody wants them at a premium. Then they really drop and show up at sites like expired and others.
The idea of getting valued domains from those drop lists is gambling you're going to find something Registrars missed and slipped through the cracks. It happens. Not often but it happens. You're digging for a needle in a haystack and without an arsenal of tools to weed out the junk you can spend a lot of resources finding a decent PR site that will hold PR for any length of time. As more and more people get in the game it's more difficult. I know people that spend hours a day examining upcoming drops and set Registrar API tools that try to register those expiring domains twice a second the day they drop. Again to think the Registrars missed these domains and the drop-catchers also missed them and you can wait and grab them minutes or hours after they've dropped is like hoping to hit the lottery.
Good luck to everyone but don't spread this BS about domains being flushed by Registrars or search engines when they drop. They lose stats when they're offline. Just like a registered domain would do if you took the site down. Once the bots hit the site repeatedly and there is nothing there, the indexed pages start dropping off the roll. The backlink checkers so the same sort of indexing and if a site is 404 or 500 then they start purging their database of records for that site. Bring the site back online and let those backlink checkers find a live site and those old backlinks will reappear for that site on those statistic sites because the links never disappeared and now point to an active site.