And if not mistaken, Dana White doesn't want his UFC fighters like Conor to do one boxing exhibition because of this reasons. But they are making good money so I guess they will continue to do business with Floyd and the Paul brothers.
No doubt that they'll continue even if Dana White says so.
There's a huge money that's being involved and they might have been offered with an amount that's hard to decline. Just like any other athlete, when is being offered with good compensation and talent fee, they won't think twice but will grab the offer.
The Paul brothers did discovered this niche that will make them and their opponents big money.