I know this topic has been brought up many times. However,it seems to me that pinball manufacturer x could save quite a bit on development of a game by not having to shell out big money for licencing rights and voice over work etc. everyone always says that the ops aren't buying unlicensed themes. that's because no one is making them.add to that most new pins are purchased by private collectors any way.if you look at the a list of 90's games. all but Adams family,twilight zone, are original themes. just my own thoughts on the subject.
add to the list Indiana Jones and sttng of licenced titles.