I wonder how many customers actually do the networking on their end to make sure they aren't the bottleneck (10g ports/proper cabling and switches) versus people who just think "it's a bigger number and I have the cash... Sure"
Residential Internet almost never guarantees speed to the Internet backbone, it is just advertising the Ethernet link speed. There are subscriptions with guaranteed performance, but at a different price.
My home Internet connections are 1 Gbps and 300 Mbps (2 links from 2 providers, I work from home and I need the uptime) for less than $10 each, but the transfer speeds are close to these numbers only for local servers, getting out of the country is about half these speeds.