Here are some reasons why I think prices are sky rocketing:
1. The bar on new machines was lowered to such an extent that as the machines improve they look like a good value, even at the higher prices.
2. Scalpers creating frenzy and artificial demand. Manufacturers raise prices accordingly.
3. Many new people getting into the hobby who just see this as the way it is. And now it is the way it is .
4. Our desire to get the latest title for fear of being left out of something great (see #2).
5. The feeling that something new and unknown will be better than something that already exists.
I would encourage people who are new to pinball to try some of the older titles, after all they will probably be new to you .
Sometimes I can't help but shake my head at the new pin frenzy (myself included!).
For example, if Stern's Striker Xtreme was released today with a better theme, people would be clamoring to get such a full featured LE and it would probably be 10k by Christmas . After all, it has:
1) 3 flippers
2) Metal habitrails (Woo Hoo! return to metal habitrails)
3) Visible ball lock area
4) Four Bank controlled drop target assembly (like Hulk) protecting a custom molded Goalie.
5) Goalie rotates with magnet to guard goal (wow! what a cool interactive toy).
6) Player controlled post to set up upper flipper shot (yes, actual player control!)
7) Hand drawn art
9) Good build quality (metal apron and slide rails)
I actually find it to be a simple but fun machine to play. I just got it though so I'm still in that "honeymoon" phase .