Funny, although I'm only reading HN every once in a while I do remember your post. My first thought was that you would never get a decent business from that. Was very impressed after I had actually clicked the link and seen the site. Today I'm even more impressed, your site looks professional and you've found a pricing model that seems viable. Not talking about your 17k users which in itself is an impressive number to achieve!
I wish you success and a sustainable business, you deserve it!