Buying and Selling in this Economy

I think the more times a car is listed on ebay the further the end price goes down. It should be sold aggressively the first time around. Have you noticed cars that stay on ebay continually? They don't gain much attention. I listed a car in the 40k range last year. A guy talked me into stopping the auction with a nice offer and even a 1000 dollar deposit. He never completed the deal and the next time we ran the auction the car tanked. People kinda wonder whats up.