I think the dealer has the right to sell the cars for any price they want to, MSRP is a suggested price. Consumers would have no problems in paying a price below that so why not above.
90K for a Shelby does seem outrageous, I would not expect them to have any takers either, and they should relieve they may rosk offending good customers they have had in the past trying to make a quick buck.
Who knows maybe down the road they will get that if Shelbys become hard to find. A car is worth whatever someone is willing to pay.
Ordered 4/26/05. Picked up June 11, 2005. 05 Mustang GT Premium Coupe, 5spd, Performance White, with red accent leather (ICAP), Shaker 500, IUP, active alarm, side airbag, spoiler delete. MODS: Baltimore Street Mods 10' red stripes and red rocker stripe. window tint. K & N aircharger. Pony Package fender emblems. Added 18" Polished Alum. Bullitts Hurst comp shifter