In that case you already got your money's worth out of MPSS.

I got in about 8 track days this season. I didn't go drifting (intentionally, that is) or did any burnouts, so just legitimate hot laps and spirited driving elsewhere. My MPSS have about 13,000km, and 5mm (~6/32) left before I parked the car. This is better than I expected.

 

Yes, I am quite pleased with the mileage that I got out of them. I generally don't get much more than 20k out of any tires on my MINIs. (My wife get's twice that out of hers).