Well.. I have been stumbling on this for about a year. Such a simple concept.

A website sells information.

Each node is a block of information with a Teaser..

User pays to view the rest of the information and has access to it forever..

I have tried it with views, signup, event, etc etc. There is no perfect solution. There are tons of posts requesting this sort of solution on ecommerce site, drupal, etc. It's much needed. Please post up any progress made on this.. Thanks.