Why dont many of the MMA & UFC fighters do sparring? and I dont mean two guys in tights rolling over on the ground. It's obvious that these guys dont do sparring in the ring. Majority of the guys get tapped in the jaw and there down. When it comes to boxing, dont say they have gloves because even with the gloves there is still the handwraps under. Which is more solid than the fist, the punches hurt more.
My reason would be that if UFC & or MMA were to start sparring, fights would go longer and be more boring than what they already are. And people would start losing interest and the octagon would be no more.

Is that a fair reason to think?