That could be a possibility, but how many dealers would use a Golden Ticket to order a Base car? Or, did the dealer take the more plausible route of selling the Golden Ticket to another dealer for a large sum of money? Or, swap the Golden Ticket for a standard GT500 allocation plus money?
Most dealers aren't known for their lack of greed.
I wouldn't be surprised if dealers adding markups put the same ADM regardless of options (ie we'll sell you whatever GT500 you want for 10k over sticker) so they didn't care if they sold 5 base models or 5 fully loaded