There are no hotel rooms at OKW or SSR, just villas (studios, one bedroom, two bedroom, grand villa). You can book them through the Disney website, but you are booking a deluxe villa, not a hotel room. Beach Club Villas are part of the Beach Club Resort which includes the hotel. Boardwalk Villas are part of the Boardwalk Resort which includes the Boardwalk Inn. Bay Lake Tower Villas are a part of the Contemporary Resort which includes the Contemporary Hotel.
SSR and OKW are 100% DVC resorts. Owners at those resorts pay for all the expenses of the resort. The only reason you can book a villa through the Disney Reservation Center website is because DVC owns a very small percentage of the resort (usually for maintenance and renovation purposes), they have taken points back from owners who failed to pay their dues or mortgage, they have taken points back through Right of First Refusal or an owner at those resorts have used their points for the Disney Collection (cruises, ABD, non-DVC hotel stays) and the associated units must be sold for cash to pay for those non-DVC vacations.