Quoted from jms121:Maybe a Star Trek pro but not quite,but it is built to last,so Jersey Jacks first ever pinball was aimed at kids and 10 year old girls,I wouldn't have guessed that,it is one of the hardest and most deep games there is.
Wizard of Oz is simply part of our culture, and everyone has heard of it and probably seen the movie. It's spanned multiple generations. It's a classic.
Star Trek...is a niche theme. Possibly with a limited shelf life.
JJP was very smart about picking this theme. Everyone has heard of it, and some people have been introduced to pinball for the first time because of it.
If JJP picked something less well known or was only popular in a niche market, I'm sure it wouldn't have been nearly as successful.