[zanewill9]

In my experience, people/companies will pay and in fact, want to, once they rely on a service enough.

People generally get that payment gives them some semblance of rights (whereas consuming for free does not).

If you're running a free service - make payment an option. It really does benefit some class of users.

[waxjar]

Taking money gives you all sorts of unpleasant responsibilities to deal with. That's not something everyone wants, especially not if you've got a day job you're not planning on leaving.