Thats because outside of Aspinall all the big guys are sort of boring. HW division in the UFC was cool for like 2 years. Brock, Mir, Big Nog, Randy, Carwin era.
I politely disagree. HW and LHW are the best divisions for finishes and KOs. Personally I like watching 170 and up the most, 155 is alright and 145 can be good. I am obviously not their current target demographic.
UFC roster has like 30 LHWs and 30 HWs and 66 135ers and 66 145ers or something like that, I almost posted a breakdown the other day. Roster is mostly smaller guys now, probably cheaper. I almost posted a discussion of the fighters under contract and still may, UFC really has loaded their lower weight classes and barely has cards with lots of bigger fighters anymore.