Here we go again with those same laments about how awful dealerships are in treating potential customers when it comes to trade-in values, "market adjusted prices" & the overall arrogance, not to mention ignorance, of the sales staff.
These complaints are so ubiquitous they are becoming tiresome cliches.
Of course most car salesman are buttheads; it's the nature of the business. Of course they will try to wring as much profit out of customers as possible, up to & including low balling trades & tacking on over inflated dealer price stickers atop the MSRP. Why do they do these things? Because most customers are themselves ignorant about the true cost of new & used vehicles so they make it easy for the salesmen to perform their magic, so to speak. Then there are the willing sheep waiting to be sheared because they have to be the first to own the latest & hottest automotive fashion statement so they gladly pay whatever inflated price the dealership is asking.
Automotive enthusiasts & those knowledgeable about actual retail/resale values are in the minority so naturally car salesmen aren't generally used to dealing with those types of customers. Add the fact that Saleen Mustangs already have a limited ownership pool & hence an equally limited resale market & it's not surprising that a dealer would be reluctant to take one on trade-in because it will likely sit on their lot unsold for several months. Look @ all of the new Saleens listed on eBay & other websites for sale. Notice, too, the depreciation of the 2005 - 2006 models.
So one salesman "insulted" you over the value of your Saleen? Perhaps he saw someone who owned a specialty vehicle for only a year or less & was looking to purchase another specialty vehicle that was particularly popular right now with a mark-up to boot, & concluded that you were one of those willing sheep to be sheared.
Cry me a river...