I think this is an interesting discussion. If you buy into the idea that this is about a philosophy, and not about cold capitalism and economics, I think it makes more sense. I love the notion that you should work at a job because, well, you *like* the job, and hey, look at that, the job pays you enough. Need to pay some dues? Work as an assistant to that job for a few years, not doing the work you really want to do, and that is your hardship, rather than poverty. Sounds good to me, if idealistic.
Obviously though, that's not how capitalism works, and arguments about human nature aside, we've all pretty much paid into the system and defined ourselves by income to some extent. That's the name of the game in a capitalist country, for better or worse. So this would be an understandable shock to just about anyone, high or low earner. This kind of scheme only works if people buy into the new system (which can take time). I think it'd be pretty awesome to see if, in time, maybe, enough top-performers from other companies join Gravity because the philosophy appeals to them to offset the ones that feel screwed. As many have said, it'll be fascinating if this experiment lasts for 3-5+ years to see the ripple effects.