DVC is not about discounts. We get a few, but they're certainly no reason to buy into DVC, and none of them are guaranteed to be permanent. The only significant one, IMO, is $100 off AP's. There are no discounts on other types of park tickets. It really is about the bigger, nicer resort rooms.
DVC is Disney's version of a timeshare. You'd be buying an interest in one of the DVC resorts. For your money, you get a certain number of points, which you use to 'pay' for a stay in one of the DVC resorts (amount of points per night differs, based on the resort, the room size, and the time of year). You can't use your points to pay for tickets, meals, etc.
The best way to look at it is as a way to pre-pay for your lodgings for the next 40-50 years (I forget what the exact number is). The DVC resorts offer studios (like a deluxe resort room with a kitchenette), one bedroom and two bedroom villas. BWV, OKW and SSR have grand villas, which have 3 bedrooms and sleep 12.
If you're very happy in a room at the values, and don't care for the moderates or deluxes, I'm not at all sure DVC is for you. If you compare the cost of DVC to a comparable number of years staying in values, you're never going to break even, let alone save any money. You'll certainly end up spending more than you do now.
The way I look at (and use) DVC is as a way to stay in deluxe (and better) accomodations, for about the price per night you'd pay at a moderate.
Sorry...