It's human psychology and incentives. It sounds "wrong" that we're getting paid for comments and upvotes. If I make a sale at work and create value, I get paid commission. Same concept. Steemit gets better content, more views, more people in the ecosystem, we all get a cut.
Steemit sure as hell won't have a commission check bouncing, that much I can say.
Cause you’re helping the plaform to find whats good and whats bad. You get rewards for that.