Let's think the other way around.
Item is at USD 300. Other bider puts in max 600 USD on first day of auction.
To me the item is 500 USD worth. Last minute bid from my software 500 USD - I loose.
I put in max 10 Minutes befor end it will go to 501 and I will know that if am am still interested in the item I have to take a bigger risk.
Since it was not worth to me more then 500 USD I might be tempted to put in + 10 % lets 550.- still lose.
If I bed risky 1000 USD max at the end I end up buying at 601 which is to much for me.
So the only way this would help me is if I can put in a max of 500 USD (what its worth to me) while item is at 300 and in last split second it would add 1 USD to the bid and (if this would be the case) E-bay would not put it to 302 for other bidder because the auction ended by the time ebay want to automatically bid for the other guy.
If the other guy put in a amount less then what the item is worth to me then the sniper software would be of help because he could not put in another bid.
So my conclusion is that the software only helps me if any otherone has a lower max bid then what I am willing to pay and/or ebay system is faulty and does not automatically bid higher because auction has ended.
Nikon D70s, Sigma 8 mm, 4 to 12 shots, Agnos MrotatorTShort, PTGui, PS CS3, and lots of other software :-)