Yeah, the high performance tires have a softer rubber compound for better grip and handling on the roads. Unfortunately, this causes them to wear faster. The high mileage tires, the ones for your grocery getter, have a hard rubber compound and don't wear as fast, but you sacrifice performance. My wife's XTerra has 70k on the original tires. I think it is all on what the consumer demands. When your average person goes looking for tires he looks for 2 things: price and mileage. He wants a cheap tire that will last forever. When your Ferrari or 'Vette owner goes looking for tires he looks for one thing: performance.
Tires are everything. It is your point of contact with the road. All the acceleration, cornering and braking is done by the tires. If you want your car to do all 3 of those things well, you need a tire that will do all 3 of those things well. And you will pay for it in both price and mileage!