I seem to recall playing as often as possible around 1969-70. Each week when my mom would go to the grocery store, there I was helping her place items in the cart. At least for the first five minutes or so. After that, it was off to the small game area between the grocery store and Target. Pins were 10 cents a play or so. No game or games stand out from that time period.
A few years after that, pinball arcades sprung up all around the neighborhood. I could walk in almost any direction and find locations each filled with 20 or more pins within a mile or so from the house. It was great. Pinball machines in the 1970s in St Louis was everywhere: arcades, bowling alleys, grocery stores, bars, quick shops, barber shops, hotels, department stores. Only place you didn't seem to find pins was at church. River cruising ship "The Admiral" on the Mississippi had an entire floor dedicated to pins and other coin op devices.
Remember when Fireball came out, didn't play it much because it was so hard to beat. Found Gottlieb games easiest to beat, followed by Williams, and Bally was the toughest. It was fun to play Nip-it, using that metal thing to grab or smack the ball, trying to last as long as possible on Travel Time. One of the tech guys was always spraying silicone on the spinner arms for different games. We would follow him around after he was done and play those games just to see the spinner whip around.
Probably played the most pin of my youth in 1974, had plenty of pocket change from grass cutting jobs, and since I was in middle school plenty of time, too. It was such a cool time to play pin, as every month or every few weeks it seemed, there was a new game to play at the arcades. As much as my friends and I would miss a game leaving, another one would come in to fill the gap. It got to where we would seek out certain games that we knew we could beat, just to see how long we could play on a quarter. At that time, some arcades were charging 2 games/quarter with five balls, and other arcades were 3 games/quarter with three balls. Satin Doll, Bow and Arrow, Delta Queen, and Top Card stand out from that time period. We could rack up games and play for hours, then occasionally sell them to someone and get our money back. When that happened, we would walk out of the arcade like kings!