[ScottBurson]

All true, but on top of being hard, trading is a competitive game. It's not just how good you are -- it's how much better or worse you are than everyone else you're trading against. Furthermore, every successful trade puts you in a better position, and every unsuccessful trade in a worse one.

I wouldn't say no one should trade -- obviously some people do very well. But most of us, I think, should be very careful, and limit our exposure.