I think it would be a good idea to put some sort of cap or limit on the number of fights you can stay in certain orgs... maybe 20 fights in all the .75 and 1 star promotions... 25 fights in the 1.5 orgs... etc etc etc...

In the highest orgs you still have a limit, but maybe every win grants you an extra two fight extension... essentially you earn your way at the highest levels... If you somehow use up all your fights at the lower levels... and can't get your popularity high enough to continue on to the higher levels? Well... I mean... sounds like a sparring partner/retiree to me. I guess that could get complicated though.

I would also suggest bonuses for Subs and TKO/KO's in the higher levels... increasing the potential earnings... and hopefully there will be more cool stuff to buy with the update...