Ultimately, there are two options for using DVC points to vacation elsewhere:
1: Use one of the exchange systems.
2: Rent out your points, and use the proceeds to secure the vacation lodging you desire.
In a dollars-and-cents sense, #2 is almost always superior. But, cost is not measured only in dollars-and-cents. It takes time to rent out points. It also takes time to find something to rent. *And* it takes time to figure out how to make use of the exchange system. On balance, it probably takes more time to complete both ends of the rental process than it does to secure a successful exchange---especially if you place an ongoing search for things that interest you.
For those who already own: only you can decide how much your time is worth vs. the financial "cost" of forgoing the rental proceeds. For those considering a purchase: it would be wise to size your purchase to what you think your *long term* DVC needs will be. If you aren't entirely sure, and think you also want to vacation places other than Disney semi-regularly, it would probably be better to under-size, rather than over-size, and look elsewhere for your other vacation lodging options.
In the interests of full disclosure, I am an "inbound" exchanger---I stay at DVC resorts by virtue of the fact that other people trade out. I've saved a good chunk of money this way, but it took a lot of time to figure it out. When I invested that time, I had the time to invest. But, over the past 18 months or so, my consulting business has really taken off. Today, I would have to think harder about the tradeoff, because every hour I spend on managing my timeshares is an hour I can't spend on billable work for a client. And, that hour of lost billable work has a specific and very much non-trivial value.