Because the fighters themselves aren’t a strong enough draw. That puts the power to the brand. There are plenty of orgs for fighters to sign with that out on big enough productions. Getting fans to care about established fighters fighting in other orgs though is what would sway the balance. But reality is the fan demand isn’t there. It’s not even there enough for the ufc as we see fans complaining about watching the same fighters you think are being woefully underpaid. Fans want them cut from the ufc but also paid three times more at the same time.They do, or very close to it. In the 12 years I've followed mma I've seen the number two org fold over and over again. Even their current number two is in rough shape and only surviving because they're backed by a corporate giant.