It's possible.I wonder if in this era if a pair of semi-popular fighters said they were going to go at it on a rooftop Randleman/Coleman style and streamed it on YouTube or Facebook, could they make more from Patreon donations than their UFC take-home. Also did Razak ever release that dang video?
Let's say that Cowboy was free from the UFC and Eddie Alvarez decided to do it. No reason for picking Eddie other than he has a bit of a name with some casuals and the hardcores know him. Rogan sends out a tweet about it or mentions it on his podcast and it could do something pretty big. Whether it's big enough to cover their checks since both make 6 figures per fight is a different story. But I bet they could get 100k people to stream it live so they could probably end up with a 2 or $300k pretty easily.