If memory serves me (and often it doesn't) I seem to recall that the logistics cost (race vehicle not included) were over $5,000,000. for the brits.
Not only did they have to lay out and groom a new fifteen mile course for EVERY run, but they were required to have several helicopters in the air to ensure someone like Seldom Seen Slim didn't wander onto the course with his burro.
Then keep in mind what the base camp must have cost.......... food, showers., toilets, sleeping quarters for maybe 50 to a hundred crew and support.
Water, Fuel, Canopy's, etc.
And I would bet that the BLM permits and environmental protocol were not cheap.
I don't know this for a fact, but lack of sponsorship was probably not the only thing that kept Craig Breedlove from staying in the game. I would bet that the Brits probably had a fleet of lawyers making it all happen. Bob