I see 2 things in the past year:

1. Very few classics available for purchase. When they are available, they sell quickly or a priced sky high. Titles previously called B list gmaes are even harder to come by or a priced 30-50% higher than just 2-3 years ago.

2. Lots of newer games that are not selling and prices continuing to drop. There is a whole new influx of pinball hobbyists that have no idea how to do much work (that is fine and their choice, but not sustainable if you want to actually see all the hobby has to offer and be able to keep even the newest games functioning for a while) and these people have collections built quickly of all NIB 5-9k games. They are now either out of space or looking for the next new thing and cutting loose the "older" games that are now 24-36 months old. These are the title that are sitting. For a while the continually increasing NIB market helped to push these used games along but that seems to have stopped and people are getting more comfortable with the cost to drive it off the lot. Some are not adjusting and games are sitting. Others that want to sell are dropping prices to make it happen.