Comparing MMA to other sports this way is pretty dumb.
No, it isn't. Maybe you are choosing to look it at from a "I have to defend the sport I love perspective," instead of taking a logical stance.
Every sport/art or whatever has a point when people can do it part-time or whatever, and still be successful. However, as the sport grows, and becomes more financially lucrative, and starts to draw from a larger talent pool in the population, it gets harder and harder for part-timers to become successful
Soccer, NFL, NHL, NBA and every sport on the planet has gone through this phase. We are just too young to have witnessed it.
I watch TUF, I watch Dana White's Tuesday Night Contenders Series, I listen to the life story of the UFC fighters, and one thing is clear to me: Most of them are not the best possible humans that could be competing in MMA.
These are guys who couldn't make the teams on the most popular sports, so, they started wrestling, and where not even the best at it. They are not academic, they are not good athletes, but they are delinquent and love to fight. The UFC comes along and gives them an opportunity to have some success in a sport that is relatively new.
This is the basic story of the average UFC fighter. They are average joe level athletes who are courageous enough to try to attain some glory in a relatively new sport.
Today's MMA fighters have the same DNA as the Americans in the 1840's who travelled across the continent for the chance of finding some gold in California. They are risk takers, but they are not necessarily the most athletically gifted people planet Earth has to offer.