I don't think that the Catalogue Values are what dealers wish they could get. It goes up and down. Wouldn't dealers want it to always go up? It's a reflection of trends that notes are selling for. I find it is usually quite accurate, especially for run of the mill notes that sell frequently. When you get something that is more scarce, it is a little more dependent on what the buyer is willing to pay for the note, and what the seller is willing to let it go for. The more scarce, the less predictable, I would imagine.