I played soccer (shouldn't he have said football?) when I was younger and I'm fine with the metric system (the real question is why they taught it in elementary schools starting in the '70s, but didn't bother switching).
I think there are a lot of people in the US like me, but we don't spend enough money to get sponsor/advertiser attention. When was the last time you saw F1 tee-shirts, or F1 drivers on beer cans? Which events are offered is all about the almighty dollar.