Yeah liability I would think. There is some stuff that you guys (non-lbs workers) might not be aware of. Like a year ago there was a HUGE recall of faulty spokes that broke really easily. The recall just eplaced the whole wheel so we threw out most of the wheels (kept a few hubs and rims), but cut all the spokes so no one would try and ride them out of the dumpster. Could be something similar with tires, or they want you to actully support their struggling business. Just a thought