You have that on mobile subscriptions usually, heavy users pay more and low usage users are not subsidizing them.

I take you are fine with paying 10x or even more for your no oversubscription Internet connection then?

Oversubscription is not gambling. The way it works after your last mile connection is that ISPs look at link usage in their network, city level distribution, city to city, transit, peering, etc, once it reaches 60-80% utilization at peak you start looking at adding more capacity. Bad ISPs (most US ISPs) will let this go too far though.