So many people have bought into it to use their points at DVC resorts.I think a fairly small percentage of members use points outside of DVC, and those that do will only do it a few times over the life of their membership. And that's fine. It becomes a very poor value if you want to trade outside of the system as often or more often than you stay at DVC resorts.
For that use, buying 'multiple timeshares' will actually cost you less than it would to buy DVC for your trades. It's often suggested here that people buy only as many DVC points as they need for their DVC stays, and then buy another timeshare (Marriott, Fairfield, etc) at resale for trading. The key piece of this is that those other timeshares are vastly cheaper on the resale market; I've heard of folks picking them up for a few thousand dollars. Your cost for the DVC points you'd need to trade out regularly is going to be far, far higher than that, and that's without figuring in the high maintenance fees.
As for trading power, in the 7 years I've been hanging out on these boards, I can't count the number of sad stories I've read from folks who've tried and tried to trade out, never getting the resort they wanted, sometimes not getting anything at all.
Empowering people with information is a good thing. That's what Dean does on a daily basis here. He knows the timeshare business better than anyone else on these boards. What he has to say may not be what folks want to hear when they're caught up in the emotion of buying DVC, or when they've just heard a rosy sales pitch from DVC, but....it's the truth. It's important for potential members to understand how trading works in the real world.
When I'm deciding whether I'm going to spend tens of thousands of dollars, I don't want sunshine and butterflies. I want someone to give me hard financial and practical information.
You can hear the same sad stories on TUG, either internal trading in a system or using II/RCI. It's never as easy as any salesperson would let you believe(DVC,Starwood, the list goes on).
Trading can be a nerve wracking experience, I've traded my Starwood week twice. Had to bail on my 1st search as plans changed. But we did end up with having a great time in Park City, UT. We will definately go back, but initially that wasn't even considered in our vacation plans.
For us it seems to work, as DH and I don't have our heart set on a specific area or resort. If I did I would either rent my week out and rent what I want from an owner or try to do a direct exchange. I think it's kind of fun to try new places and gamble a bit. But it's not for everyone.