Bruce,
I think you are 100% correct. It is a basic principle of supply and demand; the less supply the higher the price. Once the new coach buyers and nearly new buyers dry up the existing market at those great prices than the field is level again. I think when the person who buys a 2 million dollar coach for a million goes to sell it, he is not going to base his selling price on the million he paid for it but on the original price of 2 million. He is going to take advantage of his good find and not pass it on to the next buyer.
This then starts the process of bringing up the rest of the prices. I feel, and it is my opinion and we all know about opinions, that our buses will start to increase in price once the economy starts to turn around.