Quoted from TechnicalSteam:
Freeplay seems to be the way to go. Cost of maintaining coin machines, dollar changers and ATM just doesn't appeal to me.
Tradeoff is people staying all day and playing enough to go below what the average cost per game is.
Another major annoyance that I saw at Cidercade after leaving TPF was people starting 4 player games, playing a ball, then walking away. My biggest gripe about shows, and would certainly not want to deal with it at a location if I opened one.