To the OP, if you're still wondering how Disney could permit you to use the accommodations for a week for under $1000 when they would receive over $3200 from a nightly rental guest, I hope you see now how this is "possible." Disney has received and will receive plenty more than the amount you're paying toward your vacation week, for the timeshare condo/week that you'll enjoy.
Disney gets the annual dues payment from the DVC member who assigned that week to RCI so they could travel/exchange elsewhere.
Disney was paid a chunk of change from the DVC Member who originally purchased the points for that membership.
By participating with an exchange company like RCI, Disney also ensures that the room is always full with guests who are likely to spend more at the Disney venues.
Disney even gets an extra $95 resort fee from exchangers.
You also win, because you're going to stay at a DVC resort for much less cost than you would likely pay by other means of staying there. Win-win, so far.
The DVC member (who paid retail to buy in and then pays fairly high maintenance fees) may be the only one who loses out by being involved in this exchange. Their value-received for money-spent (i.e., loss) may account for your gain. However, even they may still consider it a win... if they got an excellent trade... if they were going to otherwise lose their points if not used... if they had a strong desire to vacation "this time" in a way or location that's not offered at their DVC resorts. They may value the convenience of paying maint fees to one company, with whom they vacation most often. They may not mind a higher cost for an odd exchange, when they look at their total experience of the vacation ownership experience with DVC. Most DVCers I know (in real life) don't spend any time online at TUG or DIS, even though they know about them. They work a lot, earn a lot, and really want convenience in their busy lives.