is based on image regardless of substance. It's just about putting a mask on to please as many people as possible. Politicans are the best PR
people. Some fighters aren't cut out for it, it's not a question of not having the smarts to figure that out, it's about not wanting to "sell out" your personality and who you are.
You have some fighters that love the spot light (Frank Mir, Jon Bones, Chael etc..) and others that don't (Nick Diaz, Brock, Fedor, Cain). By that logic people that don't get business degrees (social work, teaching etc..) are dumb because they aren't doing all that's necessary to acquire money. Doesn't mean that they don't want to make more in their given field, and an argument can be made that their contribution is justificion for a raise.
College education has nothing to do with smarts; it's about specialization. People come out of college with degrees just as clueless as when they went in, though they might be specialized in their particular field. Some of the smartest people I know are high school drop outs and some of the most idiotic are graduates (not the common but it happens).