[alan_cx]

Surely this is just another form of marketing, which people pour a lot of money in to, for good, well known reasons. So, I guess one would want some data on how well paying for users actually works, compared to $1000 worth of decent targeted advertising, or whatever.

[yannick]

it would be users from a list of self-described 'early adopters', the type of people who love the internet and startups and are eager to try something new.