Consider this scenerio:
A month after you buy it, your right front suspension starts making noise. You take it in to find out what's wrong, and they discover that the car has been driven over a curb (or whatever) and the strut is bent, or the strut bushing is crushed, or the control arm is warped. Your warranty won't cover items that are a result of abuse or accident. How will you feel to find out that this repair will cost you $250 - $750. Buying a used car is buyer-beware. You'd be better off buying a car that once belonged to a vested owner, rather than a car that is rented out to people who have no reason to give a damn about it.