It depends on how you define 'successful.' Most people have the metric wrong, which would be conversions. The correct metric is, "Do I make enough to pay for the effort and time doing this?"
replying to ugh and steveklabnik:
I guess I'm a cynic but I can't see people just sticking a meaningful amount of dosh in this every month for no marginal gain.
Museums have tried similar methods with voluntary contributions instead of entrance fees it doesn't work.
Now if they were to get a mention as a valued internet patron
on flattr or on the sites they give to then maybe
