Well first of, my cab is running on the great old (but now abondoned) Dutch Guilder. The good thing about this is that the coins are worthless now, so they act great as tokens.
However, the entrance to this small fair is free, with a "community" feeling, so yes, people could play for free.
I didn't set it to free play though, I just hit the coin-up button a good 40 times. Had to do that a couple of times during the day.....
It's fun to see people enjoy the game (especialy people who's age is less than the cab

) and even more fun to get people asking about it, talking about it, and the occasional guy who serious offered money for it....

I also hope to warm people for this hobby (even though it would mean more competition on the Dutch market

)...but most people said they would love to have a cab like this, but have no space for it....