I agree generally with the earlier comments in the thread. There's a valid place for second-chance offers, and both buyer and seller are free to offer or not offer / accept or not accept them as they choose.

One side benefit for a seller with a handful of the same chip -- If the seller has, say, 4 copies of the same chip, he could offer it once then sell the 2nd one as a second-chance offer. Then a few weeks later, offer the chip (3rd example) for auction, then sell the 4th example as a second-chance offer. The second-chance sales mask, somewhat, the availability of multiple examples. If it works out right, the total prices-realized for all 4 chips would probably be greater, using the second-chance option vs. four separate auctions. (Depends on the chip and depth of demand too.)