Welcome to the forum!
I am not completely sure, but I believe that the more you accumulate along the way, the more things you unlock. Like certain sponsors require a certain amount of cred to be unlocked.
Sig Credit: M.C
Miesha Tate - Urijah Faber - Dustin Poirier - Frankie Edgar - Claudia Gadelha - Tecia Torres - Demian Maia - Jessica Eye - Diaz Bro's