drop bear
Sr. Grandmaster
In the US, just look at the demographics. The UFC and the WWE share the same marketshare as each other as far as age group and who views it. Males 18-35 years old. You can bet that the UFC is going to take a page out of there book on marketing etc.
The other thing about fighters rankings etc. and a title fight. Overall, they mean nothing. The UFC will book many fights based on it's draw appeal and PPV buys. If a fighter is very popular with the fans and is a #5, they will book him a title fight before he loses and bumps his rank or popularity. Unlike boxing organizations, the UFC doesn't really have any "mandatory challengers" that their champs HAVE to fight. Granted, they usually do try to get #1 and #2 for the title fights, but if money overrides it they will (case in point, Carano vs. Roussey).
It also depends on who is ready to fight. And who is willing to fight.