Automated sniping has got to be an inevitable part of the bidding process. But the coys. who do it can't guarantee placing your bid in time when things are very busy. You have to be very lucky to beat their automated systems though.
Oddly enough, when I bought my 2.6l on ebay, I was intending to watch the bidding for the last hour or so to put in a last minute bid. Then a friend of my wife who had just lost her husband called on us, and we took her for a meal to try to take her mind off things for a while. I reluctantly placed a highest bid before we left, with a big margin over the then highest, because I really wanted the vehicle. When we came back 3 hours later the auction had just finished, and I couldn't believe that there had been no more bids above my last one, and the car was mine for what I believe was an excellent price, well below the maximum I had placed. And the car's every bit as good as I had hoped.
It's all in the luck of the draw. There aren't any rules.