Shortly after I bought my DVC contract, I learned I could use my other timeshares (I own lots) to trade into the DVC during the times when I usually travel (i.e., way off-season.) However, I am still happy that I bought DVC. It is very flexible (much much much more so than trading in), and the discount on Annual Passes is a great perk. Plus, my contract has gone up considerably in value in the three or so years since I bought it. If I have points left over because I was able to trade into the DVC with another timeshare, I can easily rent or transfer them. I wouldn't mind buying some more points, actually, especially at a hard-to-book resort such as BCV.
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Therefore the number of resales is, in reality, pretty small. The majority of those are being sold due to deaths, divorces, loss of employment, major change in financial circumstances. You get some that decide as their kids grow up they no longer wish to go the Disney (although 1) there is plenty to do outside of WDW and 2) when grandkids appear they often wish they held onto their memberships) There are a small number of people who have a bad experience ( yes it happens even at Disney occasionally) ....
Yes, I agree with this. There are lots of reasons why people sell real estate (and timeshares are real estate, although DVC is sort of a hybrid between ownership and a long-term lease.) Even lovely houses in great neighborhoods get sold as people's needs or financial circumstances change.
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Every time a new resort is opened, it only takes a few months before that resort starts showing up on the resellers sites. In order to sell a resort through the resale market, your going to have to price it below Disney's cost - and pay the commission.
Hold onto it a few years, through a price increase from Disney - get a few trips out of it - and you'll break even. Particularly if your trips involved developer points.
Buy it, get home, and sell it within months unable to use it, and you'll have paid a few grand for ownership in a timeshare you never used.
This is generally true, but I'd like to point out that paying a commission isn't a requirement. You could advertise on a site such as Redweek, and pay only their listing fee of $50 or so. Since DVC prices are pretty consistent and need to pass ROFR, your contract might sell for a price similar to what a reseller would get for you, and you wouldn't have to pay a commission.
In fact, I bought my DVC resale directly from an existing owner, no real estate broker involved. However, it involves some work to sell this way. For example, the guy I bought from hadn't considered that someone would need to draw up a sales contract; I ended up writing the contract myself. (I based it on a model timeshare sales contract I got from somewhere; I don't remember where.)