You should reserve some good dates at various resorts and rent them on TUG, Redweek and go-koala.com.
It's easy to get a few hundred per reservation over your cost. I rented Yellowstone for $2,200 in a 2 bedroom for June, 7 nights. It's worth keeping because WorldMark has resorts in areas that no other company has a foothold. Think Estes Park, Yellowstone, Washington state resort areas, Anaheim, etc. But if that doesn't make sense to you, then selling is always an option.