The machines I used to play you could put in as many coins as you wanted. It never got full and the more coins you put in, the more likely it was to give you better odds but FIVE coins?
The pinball machines here in New Orleans kept many a pool room, bar or restaurant open and people would come in after working all week long and sit there and play the machine until their paycheck was gone. And yes, if you didn't keep the tilt real sensitive, I beat 'em. Oh yeah, the machine had to give decent odds too.
I tried everything to beat them. Sometimes the owners of the establishment would just let me try practically anything because they didn't think the machines could be beat and would turn a blind eye toward me when I tried something really stupid like, slipping my toes under the front two legs of the machine to make the ball travel more slowly. These machines were so heavy they would crush my toes, so I would wear extra large shoes and just let the machine sit on the front part of my shoes without crushing my toes. That slowed the ball movement up a great deal but didn't really make me a better player. What made me a good player was my mongoose-like reflexes. I could strike a machine with lightning fast hits that could even dislodge balls already sitting in the hole (if the tilt wasn't set too light)

The bouncing ball could be manipulated the same way into holes that you wanted them to lodge in.
When I would play the machines and beat them fairly regularly, the bar room owners would tell the machine route operator/owner and he would come out and either tighten up the odds or make the machine tilt easier, then I would quit and the rest of the locals would pitch a fit with the owner and then the owner of the establishment would call out the pinball machine owner and tell them no one was playing their machines, then they would come out and loosen up the odds and make it harder to tilt. (God, that Travis Trotter virus must be going around) The cycle would then start all over. I tried not to be too greedy but those machine owners didn't like anyone to beat them, ever.
JoeyA