I always thought these guys liked the idea of being involved in the fight game, sponsoring fighters, and growing the business. It didn't take long after the death of Mask to move on.
There is a lot to be said for cashing out and moving on to other endeavors. Sure, they could be missing out on even more growth of the sport and their business, but by locking in the value now they will never have to work another day in their lives. Guaranteed.