I have an idea, but donations are to help you with your project not make you rich. Making you rich would insinuate the proceeds of your donations are going directly to your pockets strictly for financial gain rather than towards the combination of the project and your time.
Depends on how much your project and time (that you are giving away for free + donations) are worth?
Edit: I'd also say that - on some level - the sheer number of folks benefiting financially from a project like MinePeon should also factor into this...