This lack of product knowledge is the most irritating aspect of dealing with salespeople. Domestic dealers need to realize that there is a group of buyers that fall into the "gearhear" category. We know cars, have read Autoweek, C&D, R&T, Automobile, et al. Here's the vexing partc we are also suckers when we meet someone that talks our language; we'll pay your price (unless it's really insulting, e.g. MSRP++). At the same time when I meet the usual member of the gang of idiots I am unmerciful. I guess it's kind of a "don't mess with my passion" sort of thing.
I mention "domestic dealer" because I usually don't find this ignoranceor at least to the same degree at outlets for foreign makes. And I have never found this at Porsche/Audi/Benz dealers. Obviously it's because they are selling performance cars. Whereas, a dealership that earns its living to selling Tauri, Sebrings, or Impalas knows that the bulk of their customers are more interested in F&I, and extended warranties and could care less about motive power, tires, etc.
The bottom line here is that if Chrysler dealers, for example, are going to continue to sell performance automobiles, they had better start hiring performsance salespeople. The SRT-6 is on my radar (in its second year) but I will be damned before I will but it from my local dealer.