Sounds like to me that your building up equity in owning a house now instead of renting. A new pinball occasionally shouldn't cost you anything compared to the money that was just going out the door every month in just rent.
PLUS .....your building equity in your pinball machines. Not saying pinballs are good investments for retirement , I'm just saying your just not blowing away money that you will not see anymore. The pinballs could be sold someday to raise funds if needed.

Now your talking my second hobby language ! Hot summer weekends at Lake of the Ozarks !