Because the parent was talking about rewarding good job. The kitchen staff and the owners are both a factor in your good time and invisible during that time. If that's a honest opinion about the purpose of tips, then I don't see why owners/managers shouldn't share the pool. They run the place, created the environment, hired the people interacting with you. Then there are managers who deal with day-to-day issues in the place, right?

But that's not true of course - it's about owners not paying people properly.