The other ticking time bomb is really fancy features. Features that if they break outside of the warranty period - cost too much to replace.
Items such as built in navigation, DVD entertainment, fancy CD changers, premium wheels and tires, blind spot warning, or automatic breaking, all costly to replace - since they can't be fixed.
Also HID headlights cost a bundle to replace a ballast (over $700 for Volvo). The LED tail lights - the entire light has to be replaced.
It's a common misconception that an expensive car won't have these problems - but they do - and are very expensive to fix.