My 2 cents: The number of people with disposable incomes and the amount of those disposable incomes is decreasing while the cost of pinballs and the number of choices of pinballs has increased == supply and price have increased, while demand has decreased, or at a minimum remained the same.
The perfect storm may be brewing as Limited Edition has been redefined as "799" or "1,000"; the coveted crown jewel Medieval Madness is being reproduced; despite there being an LE WOZ-- a new and improved "special" edition is being produced; code issues continue to linger without correction or completion while Stern throws its money and resources into its latest and greatest new pinball release; and though, the old grail pinballs like Twilight Zone still evoke desire, their themes and technologies are getting old and outdated.
Let's face it, spending $6-8 grand on an entertainment toy that is pretty one dimensional compared to spending $400 on a playstation or xbox that can provide a variety of entertainment options is a luxury not many can afford. Sometimes I think to myself--"How many rolls of quarters did I pay for that pinball? As often as it really gets played, would I have been better off going to an arcade and spending a significant amount less, to play it and not own it?" [Wow! Perhaps that's a new marketing direction for pinball--Pinball Leasing! Yes folks, just $1,000 down and $199 per month for 3 years you can enjoy the newest pinball. (fine print--not to exceed 1,000 plays or extra charges will apply)]
And for all those Doomsdayers out there, I guess if it all hits the fan, we are not going to be able to trade pinballs for chickens or canned goods. When I was raising cattle I always said if worse comes to worse and the bottom dropped out of the market, you can still eat them yourself.
I predict a correction on the horizon.