If the auction of your item is closed and the winning bidder didn't pay you, ECCAuction.com provides an option for the seller to offer a second chance to other bidders.
So with the help this option the seller can be given a second chance to the seller to sell his item successfully. This option can be made use at the end of the auction.
If the winning bidder didn't pay you, try to resolve the issue with the original buyer before sending a Second Chance Offer to another bidder.
Note - only if the seller wishes, He can sell it via second chance offer and this is not compulsory.