I just crunched some numbers (which all DVC members seem to enjoy doing), and calculated that it would cost about $600,000 to buy up enough points on the secondary market to stay all year in a one bedroom villa on property at a DVC resort, such as at a standard view Animal Kingdom lodge. Your maintenance fees would run about $50,000 a year. For a studio it would be just under half that amount. Bottom line, you could stay at Disney year round if you had assets of about half a million dollars, income of about $50,000, and had enough money to buy food, clothing, med care, etc . . . on top of that. I actually know quite a few people who could do it, but they're not mousejunkies like me.
FYI, the total vacation points would be about 10,000 for the one bedroom villa, or 5,000 for the studio. Honestly, you may be better off with the one bedroom once cooking your own food and sanity is taken into account.
My wife and I dream of buying up about 3 months worth and staying at the boardwalk for the winters of our retirement. That would run about 2,500 points, or $155,700, plus $13,000 in maintenance fees. Mere pocket change--I wish.