ask-redweek-timeshare-resales-arda-predictions

We are getting the hard sell at a resort in Cabo to not only buy, but to also sell them our old fixed week timeshare in the Caribbean. The deal is attractive and get us out of a declining resort; but the price they are willing to pay us seems almost "too good to be true". They are citing changes with ARDA that is going to drive up maintenance fees and essentially bring the age of time shares as we know it to an end. Is there any truth to that? Is this a total scam? How can they and why would they pay high prices to acquire older time shares? Don't want to pass up a great deal but also do not want to do anything stupid.