I voted for the living room because if you're going to make a lifestyle statement, you might as well go all the way.
I own two pinball machines, and most of the time, I wish I didn't. One is in my dining room and the other is in a downstairs junk room that I rarely enter. Moving them would be more traumatic than leaving them where they are, so inertia wins out for now. Neither one works satisfactorily, and if I ever get them working again, I'm sure they would stop working again within months. Same story for my 1970 era jukebox. Most of what I own falls into the category of "Seemed like a good idea at the time."
Pinball machines are truly nasty to move, especially if your doorway is about 1 millimeter wider than the machine, as mine is. Is yours a 1-player, a 2-player, or a 4-player machine? I have a 1-player Gottlieb "4-Square," which wasn't too bad to move, but the other one is a 4-player model, and all the extra scoring mechanisms make a huge difference in weight. It was originally called "Rock Makers," but it was totally stripped and repainted by a friend of mine in the 1970's who redesigned it as a one of a kind machine whose new theme paid homage to a certain notorious erotic movie of that decade, and which was photographed and featured in an issue of Playboy. Years later, said friend needed money and his most fungible asset was the custom pinball machine, but he wanted it to go to a good home, and not just to someone who might not respect his artistic creation, so that's how I acquired it. At this point, I'd welcome the chance to give it back to my friend, but unfortunately, he died a couple years ago, so I guess I'm stuck with it.
I could go on about pinball machines, but I really need to start packing for the Game Show Congress. Hope to see many of you in Burbank this weekend.