I Need Advice, There’s A Cream (Dream) Puff For Sale

I have been to the swaps and just paid the price for a part and said, "That's more than fair". They usually looked at me like I am crazy!! But it was already a bargain to me, why try to beat the guy down, why? just for practice?
If the price is lose to what I am thinking, I will ask if any wiggle room? If they are off enough I want pay their price, then I just tell them what it is worth to ME.