for donations you would have to use some kind of credit card or paypal i'm pretty sure you cant get a credit card till your 18 most people on here are 11-16 years of age so that idea would be a fail i think
Unless individuals loaded with cash make hefty donations, a large majority of funds will not be very significant. Each game Dan buys costs at least a thousand dollars, or a maybe a few hundred. Since most people will only be willing to give up like, 100 bucks, tops, donations may not be significant enough to AG.
However, it does take a considerable amount of time to make a monitary transfer, I think. You'd probably have to go through a bunch of legal stuff just to donate five bucks, and it'd be an unnecessary hassle that most people would endeavor to avoid.