Except that the minimum rates are the prices they wanted from you anyways. It's like Verizon's unlimited legacy plan vs their 2gb data plan. Metered pricing is good for you right? Well their 2gb data plan cost as much as their unlimited plan (that you can't get anymore).
If they took their previous rates and actually prorated based on usage, then your Grandpa figure could get by on a $1.50 plan instead of $15 one. But the isp can't get by when 50% of everyone pays less than their minimum they need to stay afloat. Nah, you're still making the low volume users subsidize the high volume ones, and then you're gouging the high volume users to the point where they either find a new isp or quit their streaming.
So the poor saps back in the verizon example are paying the $20 for 2gb when quite a few of them use less than 100mb a month and should be paying... $1.
I'm even worse... I'm down at the less than 10mb a month user... Give me my damn 10 cent bill for crying out loud. I'm on wifi all the time. 99.9999% of my usage is being paid for through other providers, but I still have to pay the verizon tax to have a smart phone that uses 10mb of their bandwidth.