Cause seriously, I can get 4 before the tread is so far gone it is no longer safe for street use. If I use them to the cord, 5, maybe 6 tops. This is with rotation each track day and even dismounting and flipping them to use the other edge of the tire. This is painfully bad 
how do gtr guys deal with this. Tires aren’t cheap XD
Stockers lasted 2 days. And they aren’t dying from understeer or lack of camber. The car can rotate quite a lot. They are just dying from being driven hard and supporting a 4000lb German Camry