I split 50/50 with the owner, I have 21 machines at the location including the jukebox and atm.
3 pinball machines going to make it a fourth soon. mainly because the better variety you have, the more of a certain crowd you attract. All my pins are set on $1 per game. total investment for the three pins was 27k, since they were all purchased brand new, and they are all LE's mainly for resale value (not sure if that is going to make much of a difference).
The highest earning item is of course the 8 liners, then the golden tee's, then the pinball machines. The pins altogether make 3 to 4 hundred a week. usually the way I look at an investment is if I can pay it back in 3 years, it's worth it. Based on my calculations, pinball machines are right at that cutoff at least at that location. If it takes longer possibly, depending on what type of patrons the machine attracts. If your location doesn't have high traffic, I can almost guarantee it won't be worth it. unless your willing to wait 5 or 6 year to get reimbursed. You could always get a used machine, but that is risky in itself. I waited until now to buy one so I could take it home and get it back to mint condition. new targets, switches, solenoids, clear coat, decals, leds, t-molding, rubbers, buttons etc.. I actually have 5 project machines 4 aren't really pinball. revenge from mars, virtual pinball machine, baby pacman, granny and the gators and a second vending machine I got from aliexpress (china). I've spent close to 2k on parts already and still got a ways to go.
The down side to routing pinball machines is they are easily require a lot of maintenance at the location especially if you want the game to play "perfect". Most people won't play a machine with a malfunction. Make sure you have thread locker on hand. yearly I have to pay county, state and city tax on each machine totally $95 per, you get a decal for each. Usually once you get all the bugs worked out, it usually goes pretty smooth. Just regular cleanings, also another big reason is if you love pinball and own a machine you can swap the ones at your house for the ones at the location. That way the patrons and you always have something new.