I agree with the nice guy theory. I mean there are some who appear to be and really aren't, my brother for example. I do have to say as soon as someone gets to know me, they say I fall into the category of a nice guy to the 't' even though the first time anyone ever sees me, they judge and assume I'm a mean person because of my size and because I hardly ever smile. I mean granted I do look mean and angry most of the time, but that doesn't mean I am. It's actually quite pathetic because I've had people do really really bad and mean things to me and I've forgiven every single one of them.
I also have to say the theory about nice guys doing the nice things because it makes THEM feel better, that's not true with everyone, I do it because I feel I should, especially for the females, it's just the right thing to do. I've been that way my whole life.
It is true though, the nice guys don't really get enough credit and they sure don't usually get what they desirve.

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"Life is what you make it, watch your Karma and you will be happy in life. Always trust your heart and let God guide you as he will never lead you astray."