LFGSS: Turning a hobby into a technology startup

Donations are a weird thing... I've got to make sense of them at some point. Now I'm a company, donors are effectively customers, and it doesn't work so well to say that this is for a service already rendered via provision of the site. But the problem is that to formalise this into an exchange would change the structure significantly... should I force everyone to pay? Or should I stop donations altogether? I will spend time thinking about this.

It's not really a donation; it's a transaction. I bought a star!