If price is your main driving force behind considering DVC, then I doubt DVC would work out well for you. While it can save some money in accommodations, there are ongoing maintenance fees and taxes. Plus, if you decide at some point that Disney vacations are no longer a priority, chances are you will take a fairly large loss when you sell your contract, even if you pick one up on the resale market, as is the case with almost any timeshare.
It is likely that DVC will never be less expensive than staying at a Disney value class resort or mini-suite.
Now, if you routinely would normally stay in Deluxe class room, or rent a DVC room directly from Disney, then DVC ownership would make sense.
Remember that DVC receives none of the special promotions designed to fill the cash resorts, like the free dining promotions. From a strictly financial point of view, Disney doesn't need to offer those promotions to DVC. There is no advantage to Disney. They technically do not own those rooms, they don't pay the taxes and upkeep, and it isn't a financial liability to the Disney company if a DVC room sits idle...except for the percentage of room ownership that Disney retains.