I would agree with SD, this will be a tall bill to fill. The average DAILY on a 30-36' boat is going to be $400-600. $3000 for a week. That does not mean it is not possible, just that you are going to have a hard time finding it. The season, even in the Carolinas, is just so long, and you want the heart of it.
You might have better luck finding someone living aboard that is looking for a roommate to cover boat costs. All the usual roommate problems exist along with the fact that your apartment and stuff can move easily...albiet slowly.