It always seems like a good idea at the time, doesn't it?
Back when I was on my honeymoon with my husband at Disney, the first DVC timeshares were being sold, and I remember being really tempted. At the time, I was 22 years old and loved WDW with a passion. Now, I am glad I never bought in. Granted, it probably would have saved us some money on trips, but I am pretty sure we would have been really sick of the place. As it is, I am sick of it. Granted, I probably could have sold the thing for way more than I bought it for, or rented it out, but that would have been a hassle.
Probably the best way to get your money back is to do what the company says, sell it or rent it out. That way you recoup at least some of your costs.