[cbhl]

I would still have liked to see the same graph at 2GB and 6GB.

When I roam from Canada to the US, the incumbents charge something like $1 / 4 KB (yes, KB, not MB) of data for anyone on a post-paid plan, and deny data roaming to pre-paid users. I keep a T-mobile SIM around just for when I visit, even though I only use it for a few months every year.

If the cost of data is the same for 500 MB as it is for 6 GB (most prepaid plans I could find last time I visited were either 100MB with huge overage costs or 2GB+) then the relative expensiveness of the US goes down as the amount of data used increases.

I'm not saying that wireless data in the US isn't expensive -- it is. Besides, financial ITMPs are one of the most effective ways of regulating data use when bandwidth is finite.