I did
I used the search for opponents feature though
Every time I'm getting that work I accept a challenge and come back with the health in its original place
Unfortunately, that's till not a totally reliable gimmick. It does help, but sometimes, the damn fight requests conks out before it goes to reset the match and then resumes your match, unpaused at that. I've loss due to that happening before. You should still get a small amount of fight money doing survival, something like 100 FM for ever 10 levels cleared or something, cuz it's a drastic time waste if you don't complete it.
You also should get fight money for battle lounge matches too or at least experience points per character so you'd eventually get some fight money. I'd even be cool with them setting a daily cap amount per individual fighter you fight or even in totality if you at least got something as I do more battle lounges than anything else.