I envy you guys in the States with the flourishing barcades. Sadly that doesn’t work in Germany. You have a very small number of bars here with typically one Stern pro. These are always priced at 50 euro cents per game. Mostly pinheads play these games meaning long games and little earnings for the op. I sure wouldn’t do it.
In bowling alleys and arcades you may find multiple games and occasionally a JJP or BW game. Here the pricing is often 1 euro per game, 3 for 2. Again, at the locations I frequent games are either standing idle or it’s those darn pinheads again.
Take a game like TAF. A newbie will generally play it in an uncontrolled manner and lose all balls in under a minute. A good controlled player can really drag out playing time. So no money to be earned there.
I personally would be happy to pay 1.50 for a game on a well-maintained premium.