A couple of things. (remembering it was a excercise of imagination, not a real factory opening up ofcourse)

If I was to work at a pinball production factory, I would want to be able to learn all the different jobs so it would be more fun. Therefore, u could move around the place.
The second thing would be that you could build your own machines, which would be extra fun when playing them know ing u built them with your friends.
The third thing is that you dont have to just get stuck on the production line, you could move into game designing, sales, mechanical engineering, logistics etc. It takes alot of talented people to run a pinball factory. You could be the next Steve Ritchie ! or Gary Stern.

You could choose any job you wanted in my Australian pinball factory scenario, making it more interesting.