Buying is simple ask for a price if you like it then buy it!
If the product is bad then return it.
The price agreement is based on 2 parties. So to me it's kind of weird.
Don't like the price then don't buy
Past: Gintani stage3 M3
present: Porsche 993RWB, 964RS America,996 cupcar, 964 turbo 3.6, 991C4S, i3 in September