In these days when cash flow is king, I can understand why many parts are not in stock. If the dealer has an item in stock it means he had to buy it, some parts may hardly ever be needed and his/her money is tied up. If a special part is ordered from the warehouse and not used soon enough it goes back for credit. These days nobody likes having their money sit on the shelf.
The Crossfire left many dealers with a bad taste in their mouths because of Chrysler's demand that they take x number of Xfires and then could not sell them, they had to pay for these cars via bank loans and forced to buy tool kits etc. Many of these cars sat for a year or so while the dealer paid interest on a car that he sold for a loss just to move it off the lot.