I'm not Jakes, but I can tell you right now he's right.
Its always been like that really (same story ADSL side and to a lesser extent 3G etc). ISP price their products with reasonably thin margins & assume that people won't use more than X (will vary). End result is that all the heavy users are loss-makers for the ISP (most of mybb). The model only really works because somewhere out there is a grandmother that only uses 1.5gb a month & counterbalances it.
You'll never get "factual information" on this - ISPs guard that data carefully so nobody knows where the threshold lies but its there and its certainly way below 2TB.

e.g. Look at my previous post (Note - I posted this
before this argument started...was an unrelated comment that has become relevant now)
Note the "anyone" - denoting the top user, not the start of loss making, which (wild thumbsuck) is probably round the 500gb mark depending on usage patterns (remember ISPs buy capacity not data, so someone using 10 gig during peak is way more harmful to them than someone using 20 during off peak).
Not saying stop downloading...hey to each his own...just want to highlight that jakes does have a point on the loss making.