Not sure if I agree with how that's said. Rather I'd say that for 4G LTE speeds, the amount of bandwidth being offered at the price doesn't make sense.
For example if you're on a dial-up connection, a package offering you 250MB of bandwidth at a given price may be more realistic and due to the slow speeds it'll likely take you a long time to use up your limit. You can only do so much on a slow connection.
On the other hand someone with a very fast connection speed is capable of doing more on the internet in less time. That would mean they'll likely surf more, stream more, send/receive data more so these folks could easily go over the 2GB limit.
It seems to me that right now, the pricing makes sense for EDGE/3G devices but hardly makes any sense for 4G LTE connections. I watch the news video streams online basically 4-6 days out of the week 3 times a day and I can go over any bandwidth limits in just a week or so easily.
Why the heck would I want to buy into a device/plan that allows me to connect faster and allow me to do less with it per month?