http://steveblank.com/2010/01/25/whats-a-startup-first-princ...
Yeah, they've done that. If you do an exit and kill the product, the original need of users is left unfulfilled, so there's a space for someone else to do the same trick again.
http://steveblank.com/2010/01/25/whats-a-startup-first-princ...