I don't get how some of you are figuring the guy with 600+Mh/s is taking money from the rest of us. This is a proportional pool. He earns his share (as do we all) with our hashrate. It makes no difference if he is mining or not. You will still get the same amount proportional to how many shares you submit.
because, greed.
And also because, stupid. There are quite a few people that just don't know what they're talking about when it comes to mining, multipools, trading etc and listen to people like tealover when they prattle on about things.