I have been married to a non-pinball girl for 32 years but collecting for only 6. All I hear when I buy a new game is "isn't 7 of them enough already? One can come in but one must go out! You paid how much for that? etc"
I found that just bring them in when she's not home as she never goes into the basement anyway and its always easier to ask for forgiveness than permission - cause the answer to that is NO.