Angry Grimace
Two cannibals are eating a clown. One turns to the other and says "does something taste funny to you?"
Wait wat? I feel like this may be for the "discuss American quirks" thread.
Is normal behaviour among dealers to hike prices by themselves just because a car is highly sought? Over here any difference over €3000 on a similarly priced vehicle would raise some serious eyebrows. Dealers basically compete with each other increasing the extras while keeping the MSRP. If they dare to go €1 above the suggested price without throwing at least some extra floormats, you can just walk into another dealer and get a better offer.
It isn't impossible to find a Boss at MSRP or even lower, but it's very difficult to do without having some kind of relationship with the dealer or living in the sticks. The answer is basically that Ford doesn't make enough of them to meet demand either on purpose or to be conservative. Ironically, Bosses are often more expensive or equal to the GT500.