People keep talking about buying a phone, unlocked when they become available. If I know I will be staying with ATT for years to come, and I know I am not going to travel intl, why should I pay out $750 - or whatever upfront? Please help me understand the logic here. I could care less about a contract - have been with them for 10+ years. I am not concerned with intl. I really do not see myself selling a phone.