The titles come out so fast from Stern, that the average pinball collector cant save the money quick enough to be able to buy one quick enough after forking out for the last title.
But one good thing is, that Stern seems to keep its production runs longer these days so it seems that increases the chance of getting a title later if u havent quite got the money ready yet.
The other way to get around it, is to give AMD a deposit, and just pay the machine off over a period, therefore locking a title in unless u chose credit etc. So many choices with Stern now, its just brilliant.