If MMA is a real threat to boxing why did James Toney literally earn double what "MMA legend" Couture did when they fought?

In fact, I'm too lazy to check but who has earnt more than Toney for one fight in MMA?

Boxing has money because it has more viewers.

Couture earnt a poxy half million dollars for that fight, which isn't too bad for a rugby tackle.

Now look at some boxing superstars. In 1988 fucking 27 years ago Mike tyson earnt $20 million!! An MMA fighter will never ever earn that for a single fight. In fact Jon Jones career earnings are half of that single fight!