While the 50% sales/marketing figure is correct, as bizaro86 noted, I think your numbers are missing the remainder of the cost of sales - namely the cost of the underlying real estate/improvements/ etc. According to the 2018 VAC 10-K, here are the relevant comments of the Development Margin (essentially the gross margin for the Vacation Ownership sales business):
Sale of Vacation Ownership Products: $990 million
Cost of Vacation Ownership Products: $260 million
Marketing and Sales: $513 million
DEVELOPMENT MARGIN: $217 million (21.9%)
So based on this, if the average actual incentivized sales price per point is around $12.50/point, then the roughly 22% Development Margin comes out to $2.75/point, which is very close to the $3/point resale transfer fee.
Note: I apologize for the duplication, but I posted this before reading the earlier post from @bizaro86 about the same basic numbers. I decided not to delete since I had a couple additional stats in mine to support what bizaro86 posted, but if moderators want to eliminate, OK with me. Note to self, read ALL subsequent posts before posting!