After committing to dispense hundreds of dollars for a television, laptop or other high-dollar electronic device, the last thing most of us want to hear is a retail cashier hitting us up for another few hundred to buy an extended warranty. "No. No thanks. I'm good." Most of us dispatch it in a heartbeat. But have you ever wondered whether you're setting yourself up for a disaster? Good news: You're not. Here's why you should pass on extended warranties every time.