Don't you think this could be contradictory? If pinball is more prevalent on location there will likely be a corresponding increase in popularity. If there is an increase in popularity there will likely be an increase in demand for people wanting a machine for their home.

I'm trying to think about what's happened since I've been in the hobby. If I use the numbers below for a general guideline of A / New, A Minus / Almost New, B-List, C-List, etc. Most games seemed to have shifted up one notch in the last 5-years.

$6,000 to $10,000
$4,000 to $6,000
$2,000 to $4,000
$1,000 to $2,000
Under $1,000

Let's look at the retro video game hobby. In the last few years companies have started to release their retro games digitally on new systems. A game that costs a lot more for a used copy can now be downloaded for $5. Some feared that this would decrease the value of the original game, but the opposite happened. Most games increased in value as the games were introduced to a new audience. Sure some games went down, but the general trend was upwards. I think that is the period we've just going though with pinball. We had a large influx of new people, myself included, over the last 10-years. This quickly drove up prices. I agree with Whysnow, that prices seem to be starting to plateau. I think the volatility will decrease from here, I don't see prices going up or down as dramatically.