a lot of those cars that are not selling on ebay are cars with problems or history or automatics that typically are a little harder to sell
I have my 95 automatic for sale (the car is in good mechanical and aesthetical condition). It's been on the market for 6 months. After researching current prices for autos, I originally listed mine on the high side to see what happens. I have gotten several inquiries, but no buyer. Over the months I incrementally dropped the price, now totaling $2,200 less than the original price ($28,000) and with each drop new interest, but the car has yet to sell.
Based on feedback from one of the most serious buyers (who ended up buying another automatic for color and lower mileage reasons) he stated that a $1,000 drop in price would help, but a significant sticking point for my car was that banks generally don't lend on cars with higher mileage (mine has 113,000) or over a certain number of years of age (generally over 10 years). This has been a problem for several of the buyers that showed interest in my car. So, it appears that my price is OK, but it will take a cash buyer, which reduces the buyer pool significantly.
In addition, I feared that there would not be much interest since my car is an auto, but I have been surprised that there are people out there that only want an auto. So, I do not think that the auto trans disadvantage is as great as people think. But, one still needs to price the car appropriately.
Lastly, I'm selling my car because I have been unemployed for a year, but fortunately I'm not in a fire sale situation. I think it is a matter of time, that the right buyer will come along.
PS: I paid $37,000 for my car in 2006 and the car had 62,000 miles on the clock.