Bests & Worsts Reviews from Amazon

I bought these exact same stair treads years ago for about $2.00 apiece. I have no idea why it cost me $50 for 4 of these now. This is pure highway robbery at its finest. With price gouging like this it is no wonder we all buy Chinese imports. These are just simple plastic stair treads....why do they charge such ridiculous prices? These stair treads aren't any great quality either...they yellow and turn color. I wouldn't mind that part if I could just buy new ones when they turn yellow...but at these prices that is not going to happen too fast. Can someone explain why these clear plastic stair treads are so ridiculously expensive ?