I think to some degree the whole 'big ego' thing is a part of chess that simply isn't going anywhere. It's a matter of how you use it. Some people simply believe that they are 'too good' for their opponents. That will get you into trouble. I've learned that from experience.
A few painful losses will help you to control the ego. Lose a couple games from winning positions because you were already spending your prize money (woops :P) and you'll know what I mean.
Edit - I also wanted to mention that OTB (real life tournaments) I have a massive ego :P ... After and before the game I'm as nice as can be but during you'll see a lot of piece slamming and eye rolling :P ... Just a part of the game, provided it doesn't get out of control.
At the same time I think most good chess players know it's just a show. I've beaten people who claimed outright that they had the better position (which was simply untrue) and that I got 'lucky'. Those very people left angry, and came back the next morning a stronger player. Why? Because deep down they knew they got outplayed, and they analyzed their loss. In chess, (in my opinion) ego only becomes a problem when you start to believe your own lies :).
While this is not an attempt at metaphysics, I'd like to ask => How many of you have truly managed or even conquered your ego when playing this game competitively? Is the desire to feel the "I'm better than you" feeling hardwired into our genes? How far can it go in messing up our games?
Examples of "Ego-related mishaps" from a tournament hall could include =>
How do the stronger players keep from letting it derail their games?
Or perhaps there is a flip-side. We hear talk that some of the most dangerous GMs had this "I will break you" mentality (Fischer, Kasparov) and that their egos actually made them even more formidable?
Your thoughts! :)