Just doing the Tybee and GT300 in the same year was about $8000. It would have been (still should be) more but I double stacked with Chris Green for the Tybee and he never told me what the fuel bill was. Anytime you come up with a number Chris, I'll be happy to fork it over. Sponsors helped out alot this year on the GT but without counting new sails, I doubt I could get away with under $3 to $4K a year.
Karl, put your business name on your boat and write some of it off as a business expense (advertisement).