I've heard an adage, variously applied to academia, social clubs, and local politics, that applies here: the reason the politics in $domain are so vicious is that the stakes are so small.
People volunteer their efforts now and are quite happy to do so. If there were significant money involved, a smaller group of "professional answerers" would arise, people who could make a decent living doing this. In between you have income that, while certainly nice to have, doesn't change anything for those people.
Except it does. When you introduce rewards, particularly money, into a volunteer-driven ecosystem, it nudges people to think less in terms of volunteering and more in terms of cost-benefit analysis. And they start to feel entitled -- hey, I answered your question; where's my money? (Never mind that three other people posted the same answer, maybe explaining it better, or never mind that your answer doesn't work or is even spammy.) I don't want SE communities to become ones where the motivations change in this way. The benefits are too small to be worth the negative feelings it would engender in what used to be a group of volunteers working together for rewards no more significant than reputation numbers and badges. (And you see how people can even get cranky about those, and they're not real the way money is!)
I understand the good intent behind your request. Stack Overflow was founded on the idea of people helping people, that those who take also give. You're saying you can't give in answers and you want to give in some other way rather than feeling like you're taking advantage of others' work. That's an admirable goal, but I think we should instead realize that that original SO ideal doesn't always work, that there will always be people who contribute more and people who contribute less, and over the last 9 years we've learned that that's ok.
I've sometimes thought about ways to set up an "SE donations box" that would be used -- by SE -- to do nice things for the communities from time to time, but I've never come up with a workable combination of transparency, perceived fairness, and managability. If you're looking for ways to give back with dollars, maybe you can come up with something along those lines -- community-level, not individual-user-level.