I was going to ask the same question, but figured some rough estimates:

For seven day race (5 race days, pre-race setup, breakdown)

Hotel - $150 per night per room (three people max per room, probably need two rooms for sailors and ground crew)
Gas - passenger car $25 per day, Truck/trailer $50 per day, RV ?? (NOT INCLUDING ROUNDTRIP FROM YOUR HOME)
Food - $40 per day per person. $75 if you go fancy
Drinks - unknown
Laundry - $10

Equipment
Drysuit $1000
GPS $200
EPRIB (personal) $250
Strobes/Flares $50
Camelback $30
Life Vest (Type I) $100
Spare set of control Lines $200
Spare parts $500
Backup sails $1300
Repair equipment $150


Does that sound about right?