dumbest excuse someone gave you for not buying part/ car from you?

If there is a for sale sign on the part. Yes a price should be quoted.

But if there is a want for a part that wasn't for sale. I believe the offer should come first. Otherwise don't ask for the part.

I see there is a rule on here that when you list a part for sale you need to ad a asking price.

Well why then when you ask for a part in the want add. Shouldn't you add a price you would like to pay. Unless you are reasonable with your offer for the part. you won't be bothered by someone who doesn't want to help you.