So far besides Stern (also counting WNJM as Stern) besides Stern we have WoZ (one single game in the last 3 years by JJP), MMR which is taking forever to deliver a remake at a super high price point, AMH (less than 200 pins) and Full Throttle which has just barely started production and Nemo (less than 30 pins).
So with all the ballyhoo for new competition to Stern in the last 3 years, it seem like we have WoZ (maybe 3000 pins) and a group of other pins (less than 1000 pins total). So the competition to Stern is just not there when Stern can produce 12 different pins in those same 3 years and maybe 24K pins over than same 3 years.
Also, pinball is such a small hobby take for example snow mobiles, I don't know a single person who owns one but worldwide there were over 144K sold last year. In the US and Canada alone people spend over $34B/year on Snow mobiles.
Gun sales in the US alone (2012) was $32B
year 2012....... 163,000 new boats were sold in the US alone. (more than 15x the number of new pins sold in the whole world). there are 13M recreational boats in the US probably less than 1M pins in the US.
If I figure every (new pin) sold worldwide last year (2014) let me estimate 10K sales at a figure of $6500-$7K (mix of pro/LE/premium) that's only $65M-$70M 500x less than was spent on guns or snow mobiles. I know I am not figuring in the sales of used pins but I'd say overall the pinball market is very small and so, IMO no competition and the prices are what they are, no one is competing with Stern yet and so they can charge what they want.