Actually, None of my business

when we go shopping , we can see a lot of discount information , 30% off, 20% off , also up to 50% off , rarely heard that there are 70 % off , anyway, I have never seen before this airbag reset tool Carprog full 4.01 appear in my vision, I was kind of shock, I wondering how much the profits they have before the discount,5 times? I always doubt if something like that have Quality problems or….