What do the membership dues fund?

Hey, how much does it cost teams to race in the actual Alter Cup? (not the qualifiers)
I know the individuals racing have to pay for insurance which is pricey (although not having insurance would certainly be pricier). They have to pay for their own accomodations (unless a local is nice enough to house them). So what does USSailing actually provide other than their name- and the requirement that you must be a member to sail in it?