In the UFC they absolutely should have. I don't know for how long you has been following mma (I don't say this as a offense, I truly mean it) but if you know enough about Dana and the Fertittas, they have been underpaying these guys since the start.
Even Mcgregor doesn't get the money he deserves although he gets much more than the rest of them. That bald weirdo got more than everyone.
I guess the fighters have a different mindset than most of human beings do.
If you was still coming out of high school and trying to figure out what you will do with the rest of your time, would you even entertain putting your body through a training camp ? It takes alot to do that, let alone fight..
I know I wouldn't, no matter how many times I dreamed of having that gold around my waist and showing up to all these press conferences.
So, maybe they see going to a Island in the middle of a global disease as just a test of their manhood