I have been wondering about the exact same thing myself.
Based on anecdotal observations, I get the feeling that the collector market has slowed down, but I also agree that prices have not really dropped (not yet anyway). I suspect that I am somewhat typical of a lot of collectors who have built up a collection that they are not yet ready to part with, which is helping to keep the prices high. But I also suspect that there are not a lot of new folks coming into the market, so prices are likely to start coming down at some point. Whether that is going to happen in 6 months or 60 months is anyone's guess though ...
Very few collectible items hold their value indefinitely, but I didn't buy my kits as an investment and I do plan to build them all ... someday
