Isn't the better question to ask here whether or not "creating stars" should be what combat sports orgs should be trying to do? It's a risky proposition in a sport where you're always one bad punch away from a loss. When I think of a "created" star in MMA, I think about a guy like Kimbo Slice (RIP), whom EliteXC did a good job of "creating" through giving him favorable matchups that hurt the overall reputation of the promotion, and even that blew up in embarrassing fashion when he got caught by Petruzelli.
There's a long list of guys who were/would have been great "stars" except for the fact they lost MMA fights -- Aaron Pico, anyone? In the UFC, Sage and Page come to mind -- great talents (especially Sage) with EXACTLY the right look to be stars, but they couldn't get it done in the cage. (Also, some of us are old enough to remember BROCKTOBER, which ended poorly.)
Other orgs did a great job making Ben Askren a "star," especially given his boring fight style -- the UFC had to put him up against top competition, and we saw how that went. Jake Shields was another example of that (and interestingly, Shields himself was the guy that foiled Strikeforce's attempt to make Dan Henderson a "star.")
Just for a quick example, take a look at Strikeforce. They Co-Promote with M-1 because they're banking on Fedor being their star -- if you can't bet on Fedor, who can you bet on? Oops, Triangle.
Even giving fighters that everyone understands needs "different" opponents hasn't worked out (e.g. CM Punk and Bobby Lashley), because MMA is a hard thing to do and professional fighters are usually pretty good at it. I guess Hershel Walker was a success?
For me, bottom line is that in a sport where you can get caught in an instant and it's incredibly hard to stay on top for any length of time, and even the most dominant champions can fall hard and fast (Hi Ronda!), I think that "making stars," while it can be great for the short-term, is never going to be a reliable way to go about things the way it is in boxing (where the fights are much more predictable) or Pro Wrestling (where the fights are scripted). It's good to cash in on incredibly exciting or charismatic figures when they come along, but ultimately the "star" you should be concentrated on making is your belt.