For me, to win free game, or a match, is an essential component of the pleasure. It kills the challenge if it's disable. I prefer to pay 1$ with potential replay than 50c without it.
Closest arcade for me is Arcade Odyssey. They have RFM, which I prefer to any of their Marvel Stern. But as it's the only one without the replay, i tend to avoid it.
And yes, to find a free credit is an eastern egg. I tend to play more and end up paying more if I can start the playing session for free.
I understand it can be a psychological barrier to put 4 quarters in a machine, but maybe it's time to upgrade payment options if you really want your pins to perform.
As Chris said, when you swipe a card, you don't really know, or care, what's the cost of one game.
I'm working with vending machine manufacturers, now you can pay with your watch, and more than half of the payment are done in credit card, even for $1.
So, you can charge me $2 a game, as long as i can pay with cc and hope for a replay
