I have wondered the same thing. supra/tige are private companies and I would hazard a guess that they are not sharing that data. it would be easier to ballpark the public company product(bu).
wonder if it's a known industry average for markups and they are taking msrp and applying some formula to all boats based on your findings at 33% markup.
just for fun I looked up our boat. according to that website, dealer made around $5k on our sale. highly doubt that but one never knows.....