I don't understand the big deal...I do the same thing for free in the high school bathroom without rules. It takes skill and strategy, moreso than a normal rules fight because most of my opponents don't take martial arts and because the bathroom has four benches and a toilet stall in the middle of the room preventing some moves. I'm only sixteen, so this may be the whole teenagers think they're invincible thing going on, but I'd rather for free than for for money because I value honor over a dollar, though I do make money off of it sometimes (around twenty dollars). Most people don't mess with me and my friends because of these illegal (but fun) skirmishes in the bathroom. Experience also teaches better than most senseis, sifus, etc. do.