Enthusiasm is one thing.
People say pro athletes don't care...I don't believe that. They care a lot, but as we get older we get more subdued and learn how to keep an even keel.
Their youth and limited number of games plays BIG into it, no doubt about that. Tough to do that at the pro level when they are playing so much.
I have a theory on why college football is so huge. Lets take the big time programs which are th emost popular, lets say...Ohio State.
They win.
Simple as that.
They win.
You can count on winning 75% or more of their games nearly every. single. season. Most weeks as a fan you are oing to be happy after the game because of a win. That is one reason why a team like OSU football is so HUUUUUUGE. It is set up so they don't play too many big time games and top talent want to attend so they don't have to deal with the whole drafting of lesser players when you are good.