I’ve been playing in the house band that hosts a blues jam for over 25 , close to 30 years now. We’ve seen many mature and become excellent players , and others that have not. You’re always dealing with various levels of ability. We try and get everyone up , at times that is simply impossible. If I see a bassist in the house , I try and get them up. I have no issue letting others play my gear. (although these days I’ve been using a big orange Gretsch hollow body and most Fender players are completely thrown by that) (and yet some absolutely love it) It’s not an easy job. And when somebody is playing the wrong chords , do you play it their way , or play it correctly? When somebody that is a great player turns up you want to hear them play a little more. You cannot please everybody. They say a good night has a little heaven and a little hell. A great one does too.
I don’t see it as an ego thing.