This post fails to recognize that even if you pay full retail of $650 for a new iPhone, you STILL are paying the inflated $20/month in service charges for a subsidy that never happened. So you must tack on the $240 "Device portion of monthly fees" which makes buying outright more like $890.
While you can then sell your phone after 12 months, you still take a hit on the depreciated value of the old phone. Say you sell it for $350 on Craigslist, your net cost is $540 for the year. So when you look at it this way, the Next program isn't as bad as it seems. Remember, you are paying a bit for the convenience to finance the phone interest free and the ability to upgrade at $0/down without having to worry about selling your old phone. Convenience has a price people. It's up to you.