I'm in Washington state, the only state with the built-in bandwidth meter as of right now.
I didn't know about it, until I received an ominous phone call from a "Policy Analyst" at Comcast CSI. Their words...not mine.
Anyway, turns out I hit 800 GB last month. I told them that I had inadvertantly left my guest wifi wide-open and someone was probably downloading movies.
Heh, heh - I said, "Watch me turn it off." - and then I turned my own PC's NIC off
They let me go with a warning - and walked me through how to find the bandwidth meter.
I knew I was downloading a lot, but had no idea it was quite that much.....whoops!
uTorrent has bandwidth caps - I run two separate clients, so put their limit at 100 GB each. Figuring that no way will I hit 50 GB for my other usage.
So, moral of the story - have a good story and then sin in good faith.
I personally think bandwidth caps are stupid- here's why: