Once you get popular and have a fan base you make so much cash off TV/PPV as well as the money the actual venue (which was the only source of cash in them days) makes, that fighters these days don't really need to. So with all this cash they see fit to fight just 2 or 3 times a year. Plus fights are so much harder to make these days because of greedy bastards they take forever to get made. Before you know it 3 months have passed before the fight takes place.

I dunno really it's a good question. Just one or two of my thoughts on it.