I had thought about the same thing as I run out of room in the house. The local flea market is 10 minutes away. Depending on your local pinball scene, I think you could put them on coin drop or charge a flat fee to play them... maybe a club aspect. If you had enough interest you could try and hold tournaments, etc. Plus it gives you more room to add to your collection, and a way to subsidize it.
Curious to see if you can make a go of it. Good luck!