The shoe companies obviously don't want them to last too long. When I first started running (1984) I could get 900 miles on the outsoles on every pair of the original Nike Air Pegasus running shoes I bought for $40 retail. Since about 1995, I've been lucky if I get 400 miles on any shoe. The shoe companies are into gimmicks and bright colors and low mileage and making enough money off of all of us to make them rich, pay the NBA, NFL, and other athletes big bucks, all the while they pay pennies to people in the near slave-like sweatshops of Malaysia, Korea, Taiwan, and other countries. And we all just put up with their crap, because we have no real options other than to run barefoot or in Crocs. Sad.