Don't worry, having one is totally easy. First, you go out and buy one, totally excited beyond belief that you are about to be an ACTUAL pinball machine OWNER! For me, it was an Indiana Jones. I kept this one for several months (I had room for one in my arcade area which also housed 3 arcade games)
At some point, I found an AMAZING deal on a Space Shuttle pin. Only having room for ONE pin, I did what EVERY pinball machine owner eventually does, I bought it anyway. Somehow, space MAGICALLY appeared. Now I could fit 3 arcades and 2 pins in my home.
2 became 3 and then 4, which is my absolute LIMIT, I sold my arcade machines. So we're fine. But there is a little nook by the stairs, that can fit ONE pin right? CORRECT. 5 pins now.
Then, a deal I couldn't pass up came my way. That nook then fit 2 pins, bringing me up to 6. I decided to restore space Shuttle, so I moved it into the garage and BAM, room for another. So 7.
Ok ok ok, that's too much. But, I got a chance to get a great deal on a 2 for 1 trade, so 7 because 8.
And now, starting on thursday, contractors show up at my house to build a dedicated pinball room capable of housing UP TO 12 pins. So...
Morale of the story is, you can TOTALLY have 0 pins. You can NEVER have only 1.