They should have more rules for title holders, if that cost more so be it. Its a balance between a sport and entertainment but once fighters start thinking they can just not fight contenders and hang out for a year+ it becomes theater. Make it more economically beneficial to be fighting as a defending champ which gets better as the defenses increase. If anything, stop letting fighters and fans think they have any control who the champ fights, its annoying and a waste of time/resources plus its perfect for bots to abuse and exploit.