Its a cornerstone of building cost efficient networks. People pay for a certain sized pipe, what they pay also covers the rest of the ISPs networks and costs. With no oversubscription the ISP would need maybe 20-30x more infrastructure, do you think it would have an impact on what you pay?
Not sure why I have to say this, but, networks are not airplanes.
Not sure why I have to say this, but, networks are not airplanes.