Also check out
www.tug2.net Their forums are quite informative, and I quote from a thread
"How to Sell Your Timeshare (and avoid getting scammed!)":
Paying Up-front Fees
Most important rule: Never pay an up-front fee in an effort to sell your week! Whether the fee is called an appraisal fee, a market analysis fee, a marketing fee, an advertising fee or some other type of fee, the result, historically, has been the same for all who have reported here about their experiences.
There have been only two reports at TUG of successful sale transactions as a result of paying such an up-front fee. Neither has been verified. There have been hundreds of reports and complaints at TUG from those who have paid such fees without success.
Yes, I know you want to believe that the company “has a buyer (or several buyers) waiting to make a deposit on your week. All [the company] needs is a $495 deposit from you. It’s refundable.” Or the company has a money-back guarantee.
I know how desperately you want to believe that sales pitch. Don’t believe it! There is no purchaser waiting in the wings. Once the company has your money, they have no significant incentive to work for you. And despite guarantees and other promises, you won't get your money back when you complain!
There are narrow exceptions to this advice against paying up-front fees - for selected nominal fees ($15-$30), such as to place an ad in a specific publication or at TUG.