I always wonder why people want everything helpful to be the result of some purely altruistic action, when there's at least as much help to be gained from mutua

I always wonder why people want everything helpful to be the result of some purely altruistic action, when there's at least as much help to be gained from mutually beneficial partnerships. Symbiotic relationships not only require less friction to implement, but they're also a lot more sustainable in the long run, since both parties get something out of it as opposed to just one. Yes, amazon obviously benefits from having a larger labor pool to chose from when hiring the poor, but why is this a bad thing? If you had the opportunity to go make Warren Buffett an extra $1 Billion, but you'd only get a 1% cut of it, would you say that's a bad deal? I would hope not, because 1% of $1,000,000,000 is still $10 Million. You'd have to be either crazy or filthy rich already to turn that down just because it'd make a wealthy person wealthier. A seasonal amazon warehouse job might not be the most luxurious, but it still has an unusually low barrier to entry, and is likely to be sustainable for amazon to provide it regularly. Even most of the wealthiest billionaires had to start out by doing annoying grunt-work at some point in their careers.