I did not read all the posts but on the original question I have battled many times with people.
I have said the same thing, that I think we have ego. I believe ego is what pushes us. It's what makes us want to be good at what we do, at having a clean set up, we want our events to rock so people like us and hire us. That push to go above and beyond so when you are driving home you are thinking "I rocked that party!" To me that is good ego.
Of course there is bad ego, or too much ego, but saying that I have an ego when it comes to my DJing, is not a bad thing. IMHO.