I think this is true to a certain extent.we cannot trust the owner if he says that the car have not been tracked, but for me no point having a modified/sports/sports sedan car if u dowan to track it, whats the difference if u bring it to sepang or go for ulu yam/genting touge, can the car be categorised as "have not been tracked" if he go for touge?
if im buying an evo/subaru/silvia/skyline id be happier if the owner tracked it in sepang means
1. owner have money - to pay entry fees, car maintanance
2. knows his car's potential
3. has amateur or professional driving skills.
4. knowledgeable
The better way of putting it is buying a car from a fellow car enthusiasts, not some racer boy wannabe.
It's like buying a car from Izso or v2rturbo (to name a few, hehe), you just know it's been properly maintained and looked after.