Whoever gives the seller the desired price, gets the car.
The problem is not only the dealers, but the potential buyers who consider every seller as ''zaroorat-mand'', and as soon as he posts a for-sale thread, it gets bombarded with ''hello? are you out of your mind - its a ten years old car", ''over priced'', ''demand too high'', without considering that there's a room for bargain everywhere.
While the potential buyers are posting such comments ''trying'' to bring the price down, the investors grab the opportunity.
My theory is - if you really like a car, don't miss it for 20 odd thousand - you'll spend more in your search and may end up with something not-as-good.