providing incentive to WANT to give the project money
If you want money, ask for it at least.
Requiring it is better because it makes your work sustainable.
Require enough of it that you are not trying to figure out how to avoid work.
You are not obligated to save other people money.
And if you feel like giving back, take some of the money you get and use it for food for people who don't have enough to eat.
Good luck.