How about a cloaking device that makes the car pink when parked? Oh wait..why not make it then ;) D'oh!

There are many reasons, like it was expensive, and contracts based. But the principal reason is the lack of support. When there is no customer service number to call ( at-least in the beginning), you are doomed. It was a major strategic blunder to rely on the e-mail as a form of customer service and not setup any adequate support framework. A half-baked and naive idea.