Earlier quoted context omitted.
"Asking for donations doesn't work" Depends. I have paid for things I could have gotten for free, and raised money for political organisations (not in the USA, so we could not sell laws the way the Americans do). The best way to get money is to ask. There is a lot of research into the best ways to ask, and what gives best results. But just asking thoughtlessly (not accusing you, no idea how you asked) does not work
That doesn't prove that donations work. It only proves that you sometimes donate. Most people don't donate to most projects.
Using the methods I outline.
Not proof, but I have experience and I tell you, done properly donations can be very lucrative.