Maciej's post "Don't be a free user" [https://blog.pinboard.in/2011/12/don_t_be_a_free_user/] is still one of my favourites. The whole concept of doing something that is "just big enough" in ways of financial success and scaling is so liberating. You will end up doing something sustainable instead of constantly worrying about the outcome of your "startup" adventure. I even adopted the one-time payment business model for my own service [crofflr.com] which is so refreshingly anti-business, you will meet users that activley complain that they can't pay you more. And after meeting Maciej in real life (hope to see you again here in Berlin) and learning how much he cares about Pinboard and it's users, I'm totally convinced that this is the right way to do business and that it's okay to ignore all the flashy Yo, Snapchat and Pinterest crap out there. I really like the idea of Mom&Pop businesses on the internet.