My kid didn't even know those things moved til someone else put $2 in. He just wanted to sit in a bus. We usually hang out at the ride for 15 minutes or so before heading back to the car on shopping days, I feed the baby and he shouts 'beep' and sings 'the wheels on the bus'. Due to his intense enthusiasm he has gotten free rides. We say thank you. I rarely have cash so can't reciprocate. If I ever get around to having physical money then I have no problem with free loaders. Provided they know the words to wheels on the bus.