No offense Kirby but that seems a bit silly to me. Maybe I'm just greedy though.
Maybe you are. xkcd and Wikipedia are completely free to noncommercially use, remix and copy and the sites do not have any advertisements. Both of them make money from donations, and xkcd also makes money from merchandise. While Wikipedia is a non-profit organization, there aren't many people that think that it's an unsuccessful organization. And xkcd makes at least enough money for the author to live comfortably, just off of the donations and merchandise.
Sponsors and advertising and selling and making money in general just kinda smells. Monetizing things that you absolutely don't have to makes you feel like a greedy little parasitic minx, but everybody's gotta eat, right?
But Xion, there is nothing wrong with giving time and money to charity. Making completely free games (or anything) is an honorable thing to do, in my eyes.