Well, I guess it's just the ones I'm around then. I've found that humility tends to be inversely related to talent (not always, though) and only one drummer I've ever worked with was that arrogant (but he was quite possibly the most arrogant musician I've ever met) though I've worked with many talented drummers. I find that egos really get in the way when trying to work with other semi-talented musicians, especially guitarists. As a semi-talented musician myself I’m not saying that I’m immune either, but at least I’m aware of the problem!