I am either playing or fixing so I do something pinball on probably 5 days a week.
When I have a project game, I play 1 or 2 times a week but it may be 1 game each time on non project games. When I am between projects I play 4-5 times a week and try to play at least 2 games on each game and work through the lineup to make myself a better player. I play better when I play 1 or 2 games on all of them vs playing an hour on the newest game.
I find my games get about 2000-2500 plays a year no matter how many I have. I assume that 6-7 game daily average is boosted by friends coming over and playing for 6 hours straight 10 or so times a year.
However at $.50 a play, that's $1250 max a year vs playing on location which I do a lot also.