For a studio or 1 bedroom, renting from an owner (no cancellations, you need to buy travel ins. if you can't self insure), around $200/night. If renting from the resort (advantage = ability to cancel), around $350-400 night. For a 2 bedroom, renting from owner about $2.5K for the week, almost double that renting directly from the resort. We've been doing this for 13 years, so I know of what I speak. And this is during shoulder season...peak season costs are much higher.
As I stated in another post, timesharing is not for everyone and you need to own the right resort system and be willing to educate yourself. In other words, know how to play the timesharing game...it's w*rk
.