Premiums are too high. Simple as that. And in over 20 years, I've used it once and would have paid out 7x what the very expensive ($700) phone cost in premiums already if I had insurance. Plus the $150 deductible at the point of need... Pretty much makes the insurance useless unless you need it only a very short time after buying a phone... Otherwise it's just a scam, everyone gives them a ton of money, they have to pay out very little in return. Very few people actually benefit from the situation. I've had case phones, even on my S4 and HTC 3D that I could, and have, literally thrown the phone crossed the room (freaked out the kids at Sprint... LOL!). So cracking the screen would be the only real threat. And I can fix that.
So, I'll pay for a new phone, even if I can't get it discounted somewhere, should the worst happen. In the long run, it's a lot cheaper unless you're a horrible klutz.