If your implication is that "some" people get into the sport for self indulgent and ego-driven reasons, then I think you are correct. Others, however, choose to train MMA for many reasons that have nothing to do with proving something.

Personally, I really don't want to develop cauliflower ear and a lot of scar tissue, but some guys actually like it. I try to take it easy and avoid as much contact in training as I can. My wife reprimands me for black eyes and scratches, so I don't think she'd be too thrilled with the look you're describing.