if your average player is 1-tabling, he's getting (maybe) 80 hands/hour. that same player at a rush table is getting 250 hands per hour. rush poker probably tripled their revenue. who knows how many times it multiplies their profits.
Edit as an ex midstakes amateur, frankly I speculate rush is unbeaatable after rake bc the nash equilibrium style is ez and widely known, good players have no edge, bot wet dream. Sent from mobile
I only tried rush poker in passing once. By the time it came around, I had already been out of the online poker game (I pretty much gave it up after PartyPoker withdrew from the market), but if the tracking programs w/ heads-up displays still worked and you could get enough data on the people you were paired with, you could figure out people's pre-flop tendencies enough to probably squeak out an edge. Losing post-flop data hurts though, unless that data was still tracked even though you moved on after folding.
also, for the pros who would normally be 16 tabling, there is only a small uptick in hands per hour in NL rush compared to standard 6 max tables.