because maybe there is a lot of hype over performance tires that is simply marketing fluff designed to get you to pay twice or three times as much? tire rack and other sites have performance reviews on stopping distance, traction etc and the tires themselves are rated independantly on the sidewall. informed consumers are smart consumersTires are literally the most important thing you buy for the car. They are a bigger safety feature than even your brakes.
Don't understand why you would want to try to save money there.