I built the site, but then I thought, omg I'm going to lose all these users once they leave.
So I added a MailChimp email box, then a chat group, a forum and kept making more for them. That's how people kept coming back and finally paying money.
Been following your blog for a while now Peter, since I first came across the article Wired did about you. I'd love it if you wrote a post about this, and your success in generalup until this point!
I will! My blog is a perpetual backlog of posts, but it'll happen :)