Could you clarify what you mean? Why do you think people donate to political campaigns if not to receive something back? I don't believe there is anything inherently wrong with that. I just think it becomes wrong when one party can flood the voices of others with the amount of money they donate. That makes it an unfair process.
I've mentioned before that the company I worked for donated to both candidates in senatorial campaigns.
They wanted some influence (presumably) to get what they felt was unfair foreign dumping relief.
There was foreign subsidised dumping (selling below market price forcing domestic prices down) going on.
But they didn't always get what they wanted. Trade cases were often rejected when the arbiter ruled they were profitable and not hurt by the dumping.
Was what my company did a bad thing? Maybe, maybe not? The point is they donated money, they didn't always get what they wanted. Why can't I conclude this happens elsewhere? I know it does.
Is every attempt at 'influence' bad? What if you're trying to 'influence' not destroying the environment?
Every campaign contribution isn't geared toward the 1%. That's not to say that some are.