sea - 6:18 pm on Jul 1, 2001 (gmt 0)

I think one of the problems you would encounter with making webmasterworld (if that's the idea) PFP is this: You'll lose alot of the spontaneous posts and alienate people that have never had a chance to use it for free. There may be plenty of retention and the reason is content, and the content isn't just from a few people it's from a large group of people everywhere.

A good subscription based model would be to charge for your newsletter, assuming you have a steady base, but once you start charging it won't grow as quickly.

Another good model would be to hold back portions of the site that have all of the new methods of SEO that you come up with basically access to your methodology.

Don't know how much this helps, but I can say when content goes from free to paid you're bound to lose a few people in any business.