To us pinball collectors, there is nothing wrong with having 4 or 5 pinball machines, or even ten times that, but the first thing most people say when they see so many pinballs is that they think u are completely nuts, addicted, a sandwich short of a picnic.   

Here is an example, imagine walking into a persons house and you see they have 40 cats, whats the first thing that comes into your mind ?  yep thats right, the person has a mental problem, (the 2nd thought is that you want to let go of a large rottweiller and watch the action.lol)   but if you collect pinballs, you say, oh how cool.

If someone got on TV and showed off a large collection, the public might think we are crazy people, hence the 4 x machines only was the pick for a decent ficticious TV add, and seeing 4 machines at someones house might send a subliminal message to say its OK to own 4 machines. That was the hybrid thinking behind 4 machines on a TV advert. lol

Daz, u havent picked 4 machines, get back here.lol and add those 4 titles please kind sir.lol