You don't consume bandwidth.
No, technically you don't consume bandwidth in the exactly the same way you consume gasoline. But in his example, imagine that there was a magical gasoline fountain in North Dakota that produces an unlimited about of gasoline. All of that gasoline in ND doesn't do a bit of good for the drivers and shipping companies in Chicago. It does them no good until a pipeline is built. That pipeline isn't free to build, pipe, pumping stations, and valves all have to be purchased, then someone hast to be paid to put all of that into the ground. On top of that, people have to monitor the pipeline to make sure it is still working effectively and isn't leaking. Now you have an unlimited source of gasoline and a means to get it to Chicago. But, due to physics, that pipeline is only able to move enough gasoline to power 1,000,000 car-miles/month. You know how much it costed you to build the pipeline, you know it's life expectancy, and you know it much it costs you to operate and maintain the pipeline every month. Let's just say that works out to $1,000,000/month. Now you have unlimited gasoline, but it costs you $1/car-mile to get it to Chicago. What's the fairest way to recoup your money? Do you charge a $1000/month to everybody, regardless if they are a person driving 100 miles or shipping company that drives 10,000, or do you charge them per car-mile?
The example works with electricity, water, gasoline, mountain dew, or Internet. The only difference among them is the input cost of the product, and the physical method of getting the resource from its source to you. Yes, the Internet bytes themselves are infinite and free, but getting them from one place to the other is a finite resource that costs money and has to be paid for. The gasoline has a cost to produce as well as a cost to distribute. Both the source and distribution are finite, but you still have to cover the cost of both.