Hi John,
The Second Shot feature operates on the existing bids when Auction Sniper goes to place your bid. Considering the very short lead times involved, there is no way for our system to monitor and change all of the existing snipes in relation to bids which come after them.
The feature was invented to beat the 'Proxy Bid', which is eBay‘s bidding system that allows bidders to place bids reflecting the maximum amount they are willing to pay for an item and makes it so the winning bidder will always win the auction for the minimum portion of his/her maximum bid that is required to win the auction based on any other bids that have been received, bid increment rules, and some other factors, such as the presence of a reserve price.
In other words, if you place a snipe that has Second Shot enabled, our system will first submit your specified maximum bid at the lead time you selected. Then, if your original maximum bid is immediately exceeded by an existing proxy bid, our system will submit one more enhanced bid that is the specified number of bid increments greater than your initial maximum bid.
- Craig