[pedalpete]

Though I completely agree with you, the problem these guys are trying to solve is when does the mid-sole break down, which can happen before your shoes look worn.

The bigger problem is that depending on the shoes and milage and runner, I believe the destruction of the shoe will vary.

Having said that, I too don't think there is a market here, but think your idea of a discount on my next pair of shoes is a great idea.