You're right its all about aggression. You probably bet differently in a tourney. In a tournament you can spend 5 bucks and get 1000 chips. In a ring game if you spend 5 bucks, that's exactly what you bring to the table...5 bucks. Also in a tourney everyone starts out on a level playing field...with 1000 chips or whatever. In a ring game you could start with a $20 max buy-in, and there might already be 3 players sitting there with over $150 bullying you around with their stacks. You can make more money at a faster rate in a ring game, but you can also lose money faster too, and whether you realize it or not you probably adjust your playing style slightly. That's my take on the whole thing anyway.