I'm in two minds - I create content here because I can make a good amount of money, but similarly I can link to anywhere that I want to without getting slammed like I would on other sites. I think I'm highly motivated by monetary gain though.
As for commenting and engaging then that's different to me. I really appreciate a good article, like this one. So I'd certainly upvote a $0 post and comment and engage - whereas I would definitely miss out a $10,000 post that adds no value to my life :)
But that's just me - I have no problems with people using this how they see fit, because in the end, our community is what it is :)
Why don't you try the challenge and see what comes of it? Just 24 hours. I agree, people can do whatever they want, but this, for me, is mostly about helping people find out more about themselves.