incrediBILL - 7:58 pm on Mar 13, 2010 (gmt 0)
Paywall is a clear fail.
I ran a 100% free ad supported site for over 10 years and last year switched to paid membership. Visitors are still free (for now), but membership is no longer free. If you want to be a member and put your information in front of visitors there's a small nominal one-time fee.
It was slow the first month or two, but after people realized I meant business, registrations picked up real quick.
So there are ways of making people pay without pay-per-view.
The site isn't free any more, and it survived, that's the real story.