What are the alleged advantages of this pricing model? I have to say that as a user, I don't think I'd sign up for anything with this kind of model. If it's "

What are the alleged advantages of this pricing model? I have to say that as a user, I don't think I'd sign up for anything with this kind of model. If it's "donate what you think it's worth (including zero)" that's fine; otherwise, just tell me how much you want for it, and I'll decide if I want to pay it.