my feeling is these price increases have less to do with real economics or inflation and everything to do with shifting demographics in the pinball buyer market; meaning the shift from pinballs being a potentially lucrative machine that can be routed to a luxury item for wealthy folks.
For almost a hundred years the purpose of a pinball machine was to make money for the owner by being put in a public place and being paid per play. Home collectors were only a small percentage of the market.
Now I believe it is very difficult to make money or even break even routing a NIB machine at 7 to 10 thousand dollars. Most of the buyers for NIB are wealthy collectors who could care less about a thousand dollar price increase. In fact, in their eyes, the new prices just make their collection that much more valuable and exclusive.
Most of here bitching are stuck in the old mode and haven't accepted this new reality, understandably. Pinball was suppose to be "by the people, for the people," but now NIB is another indicator of wealth. So be it. Obviously a PS4 is a much better deal for your gaming dollar, but every kid in America already has one. Having a 4000 square foot McMansion with 5 modern sterns in the basement is how the new Gatsby's roll. And ultimately the rest of should be glad of it because otherwise pinball would be dead. Sooner or later they'll go bottom up or get bored and move on and sell those HUO machines at more reasonable prices and us pin-freaks might finally have a chance to grab that coveted SW premium at 6500. :-/
In the meantime, if you just love to play pinball (like myself) you really don't need to own more than one machine at a time, and it doesn't have to be the latest and greatest Elwin. And if you are a router and are making money of NIB, please, tell me how! And if you are a collector with a dozen machines already and are disappointed you can't afford to add another NIB with these prices, well, welcome to the "poors" club.