mixed ceramic cpu lot

I sold a ceramic cpu lot on ebay. The lot consisted of 6 pounds of pinless ceramic and 5 pounds with pins. It sold for $500. Well it turns out that the buyer was not pleased with the gold yield of the lot. "Sir, because of those worthless SUN Ultra Sparc CPU's in the lot, which are comprising about 60% of it, the refined value of precious metals is $550 about, which is around 10.5 g of 24K Au. For the price I paid it is better to return these back to you because the refining for such a base price is worthless. " So i had to refund $150 to him as requested. The lot shouldve sold for $260. I still netted $28 per pound for the lot. Obviously i know the pinless ceramic are worth less than $10 per pound. Its just amazing how other people have no clue. I hate preying on other peoples lack of knowledge but the money is just too tempting. Im just curious abot other peoples experiences and how they handle this. In the end both the buyer and I were satisfied. The buyer got $550 in gold out of $350 in scrap, i got my pinless ceramic sold.

I dunno if i would have given him anything back. He bought them as a Lot, I know if i **** up at an auction and win something its mine now.

I sell vintage electronics and computer parts on ebay and out of the four items I sold last night, Two said they didn't want their item after winning the auctions

I do alot of used car parts on eBay. Yesterday we had a guy click the buy it now button, and then try to offer 75% of the buy it now price. Uh dude, you already clicked the Buy it Now button. You pay full price lol.