Tread wear isn't a measure of quality, it's a measure of the how much 'grip' a tire is designed to have. High performance tires are softer to grip better, but

Tread wear isn't a measure of quality, it's a measure of the how much 'grip' a tire is designed to have. High performance tires are softer to grip better, but wear out much much faster than tires designed for higher mileage. The higher mileage tires have worse performance characteristics - greater stopping distance, etc.