Hmm...
You mean like they could financially reward people for the best submission of the night?
Reward people for the best knock out of the night?
Oh wait they do that...
Have champions who not only have multiple blackbelts, but have won the vast majority of their fights by finishing opponents via submission or knock out?
HW: Cain Velasquez: 9-0, (8 wins via KO)
LHW: Jon Jones: 13-1 (Gaidojitsu Blackbelt)(8 wins via KO, 5 of which in 1st rnd, 3 wins by submission)
MW: Anderson Silva (holds 3 Blackbelts) (21 of his 28 wins have come from ko or submission, 14 of which in the 1st rnd)
WW: Georges St. Pierre (holds 3 blackbelts) 8 KOs, 5 Submissions.
LW: Frankie Edgar, not a brawler but a grinder, wins mostly via decision and boxing footwork.
FW: Jose Aldo (BJJ Blackbelt) 14 of his 19 wins via finishes, 12 KOs, 2 subs.
BW: Dominic Cruz: Another grinder, (BJJ Blackbelt, TKD Blackbelt).
Point is mostly skilled Martial Artist at the top, certain guys might get more attention at times because they are more charismatic, but that is the nature of the beast of the public spotlight.
Phillip Seymour Hoffman can act circles around Tom Cruise. Yet who gets more attention and more money?
I think if you look with an open mind, and understand what is going on in MMA, you would see a lot of skill, tactics, angles, footwork, strategy going on in MMA, both standing and on the ground. The problem is there is a lot of parity, and a ton of skilled guys. If a guy is just as good as you on the mat, then submitting him is a lot harder, and you end up with more stalemates and position jockeying then you do finishes.
"Have a black belt fight like a black belt".. I think you might have a misperception about what fights look like in general.
Here's the two top Wing Chun masters in a fight with each other: http://youtu.be/szdF1nIAfpk
The truth is when you put two skilled people in a fight against each other, it typically ends up with a lot of feeling out, sizing up, and engagements. Skilled opponents generally don't make it easy to get knocked out or submitted.
Just my two cents.