Since your next stay is at Port Orleans, let's see how far 200 points would go in a
DVC studio room.
A studio at Old Key West, Sunday to Thursday night, in Adventure or Choice season (Jan, Sept, Oct, Nov except Thanksgiving and first 3 weeks of December) will run you 8 points per night. That means for 200 points you could get as many as 25 nights in a DVC studio.
With maintenance fees of $800, those 25 nights would cost you $32 per night. How does that compare to what you are paying for your moderate room?!?!
Other DVC resorts / room types / seasons / days of the week will require a different amount of points. As they say, your mileage may vary. You can use the point calculator on this web site to plug in some of your own criteria and "price" out the stay.
There are no resort taxes--you pay NOTHING when you check-in at the resort.
There are also a few other ways you can save here and there. If you finance the purchase though DVC, the interest paid should be tax-deductible if you itemize on your 1040. A portion of the annual fees represent property taxes, which are also tax deductible. Lastly, even in a studio you get a kitchenette (mini fridge, toaster, sink, microwave.) Just two people can easily save $30-40 per day buying things like bottled water, soda pop and breakfast food (waffles, pop tarts, cereal) at a grocery store rather than paying WDW prices.
There are a few situations where DVC doesn't make sense for people. If you like to make long weekend stays, it will be difficult to justify since the point costs are much higher on the weekends. It can be difficult to book on short notice, so DVC typically works out well for the advance planning crowd. And, remember even the smallest DVC rooms (studios) feature better amenities than most Deluxe resorts. So comparing costs with a Value resort just won't fly. These are not value resorts.
But beyond that, there are many very good reasons that 80,000 families have chosen to buy into DVC.