There is no known market price until after we donate. Your principle # 2 fails. We could be paying a reasonable valuation or not, nobody knows. This is silly.

You can not expect this market to rationally determine a price for your project given that they have not seen the project, do not understand it as you do, and literally can not understand it like the devs do. Anyone of you might not be woking on the project in a few months due to any number of reasons. This uncertainty cripples your notion of market price. You are playing off their emotions that you will make them rich. At the same time asking them to donate not knowing what you are valued at.