I understand not wanting any neighbors, but it seems like buying their house to get rid of them is drastic. You'll end up maintaining two homes with the 2nd bringing in no rental income to offset ongoing costs like taxes, insurance, basic maintenance (yes there are some even if no one lives there), aging décor. It seems like you would be better off selling your own home and buying another with some land buffer between you and your neighbors. Then maybe you could keep a few of your games as well, unless you're just burned out of pinball.

Either way good luck with selling your games. You have an impressive collection.