The funny part here is I don't really follow the sport like that but I would bet I interact with more mma fighters than anyone here. The cost for their camps are at the least doubled of what the avg boxing camp cost due to the # of trainers that have to be paid. At the LEAST two coaches have to be paid, I know people that have paid four trainers in their camps boxing/MuayThai, bjj, wrestling and strength and conditioning.
Now a guy that loses and gets paid 8k has to pay taxes, give everyone their cut, pay his bills etc. You guys bring up sponsors but unless you are getting sponsored by the big dogs you are not seeing any real money. There is a reason that most of these guys have to wait until the night of their fights to get older injuries treated, it's because that's the only time of the year they have insurance.
bbbbbbut they are getting secret money that we don't know about
Obviously this doesn't apply to the dudes at the top(even though they are getting fukked as well).