When is it a value
I would concur with one caveat ! If you are buying with the intent of trading points so you can go anywhere, then go as cheap as you can, BUT be sure the offer is legit and has not hidden attachments ( ie. past due fees with liens, etc. )
I do disagree with the "nothing is worth the retail price" because sometimes its the only way you get what you really want. A lot of people here recommend that your primary goal should be to buy at a location where you want to go every year. In some cases you will find available properties discounted, but other times, they just are not available. If you spot a place and you can see that as your vacation destination for many years to come, and you check the resales and find none available, then its quite possible you will have to pay the full price. You just need to decide which is more important, the money or the destination.
I find it rather amusing that people here are all to quick to criticise anyone who bought at "full price". Without those sales, those destinations would not be available in the first place, so no one would have received a "deal".
If I were in the market, and I saw the right resale, I would go for it. But I also bought at "full price" ( which was way under most prices I see here for an ocean resort ) and I use it every year with absolutely no regrets. The location and use week were exactly what I wanted !