Well to be fair, without Dana/Fertitas, most of these guys wouldn't have a sport to have a career in.
This is very true.
When Zuffa bought the UFC, fighters were getting paid next to nothing. Zuffa invested a lot of money, operating at a huge loss, and scratched and clawed until MMA was profitable. Fighter pay is exponentially better now than in the beginning, and it's getting better all the time.
Though we can all agree most of the fighters deserve more share of the pie.
Probably, and they're slowly getting there. Ten years ago I used to ask fighter pay increase advocates what would be reasonable, and Zuffa surpassed the numbers they put out there long ago. The fighters could make 90% of the revenue and you'd still have people complaining, because fuck the man. Apparently the fighters are the whole story and the guys that built the platform and invested tens (hundreds?) of millions of dollars are just leeches living off the toil of others.
The top boxers are making more money because they don't need the best platform, they can sell pay per views on their name anywhere. Maybe one day guys like Conor will be able to do the same, but without the UFC, who would have known about Conor in the first place? He was already a champion elsewhere, but how many eyes were on him? How many were paying to see him fight? MMA is still growing, it's a very young sport, and I have no idea how far it will go. If it gets popular enough, the current pay balance won't be sustainable, and the fighters will get paid more, or at least the superstars will, and probably the mid tier guys. The bottom guys in boxing still get paid nothing, so not sure what will happen in MMA.