Registering Dropped PR domains.

[Lasher]

I know that Google eventually drops PR on domains that have expired and been picked up by someone else, but it seems to take a while. I just checked a couple of PR 4 domains that dropped last month and were directed to parking pages and they still have PR4.

What, if anything, is to stop someone from picking up a bunch of PR4 and PR5 domains and put them up as sites with a handful of newly written articles (quality doesn't have to be high, just enough to be considered unique by search engines) and then linking to a bunch of your other sites that you want to build PR on? Knowing that they will eventually be worthless once Google updates the PR, is it worth it to build PR on other sites in the short term?

 

[Rush]

If at all the expired name looses it's Pagerank it will only be when the Google update happens. It takes place approx every 3 months. Last it was on 04/04/06.

Also it is not certain that an expired domain will loose it's Page Rank, i have picked up a lot of these names with over 200+ IBLs and none of them have dropped its PR since almost a year now.