The simple fact is that whatever value a timeshare may have is in the use not the purchase price. Whatever you pay - resale or highly inflated retail - is money lost. All it gets you is the right and obligation to pay usually rising fees and if you do you get use of the resort for a period of time or an allotment of points. If you love a place and want to return then those fees can be worth the cost. If you can trade it or rent it easily then it's worth the fees. But if what it represents is an off season, not particularly in demand use time or a resort that may not be the best or have a ton of features to increase use times then it may make more sense to rent than own.
So resale "value" as in purchase price, even for the best resorts/times, is usually $5000 or less - often MUCH less. There just isn't any true worth in what is paid as a purchase price. Only the use holds any value at all & that is a tough sell. If you can see the use value then a "worthless" (in purchase price) ownership you can get great deals from a free ownership. If that ownership costs more in annual fees (even with no or low initial cost) than you can easily rent it for then it may truly be worthless no matter what the original buyer may have wasted in paying the initial purchase price. That money does nothing but go in the developers pocket & is totally meaningless in the resale arena. A timeshare is worth what the market says resale - not retail - price is. More and more that "price" is zero and may even require the seller to pay the transfer fees to make the "sale". That doesn't mean you don't get a good value by taking the deal for a place you want.