iPhone 5 excessive cell data consumption
More details and the fix for verizon is here www.huffingtonpost.com/2012/10/01/iphone-5-data-ap...
I do, however, use the wifi at my work and home, often turn on location and close old apps daily or semi-daily. If I'm on the road I turn on wifi and sometimes even turn on location to save the battery on a long trip.
There's actually an app to see how much data you've used in the month: myAT&T. It seems to be consistent with my usage.
If this is true, people like yourself should be throttled for hogging so much data that others suffer.
That's where I am agreeing with the OP that something just doesn't make sense. If I really cared I would keep a log and reset my data usage stats daily to track this down but since I have unlimited data and other ways to spend my time I don't.