You could, in theory, install 2 foot diameter pipes in your house to run water through. If you like a really forceful shower, or want your hot-tub to fill quickly, bigger pipes would be your first thought. Imagine your surprise if you had someone come in, and install huge pipes on the inside of your water meter, only to discover that you didn’t get a whole heck of a lot more water through them?
You see, the meter is a choke point. As is the pipe leading up to your house. It’s not just the issue of the pipes internally, it is also the external environment and the gateway to your house that determines how much water you can move.