Mears did that with a bunch of pennants about a year and a half ago. They had 25-30 pennants all ending at the exact same time. Never used a sniping service. Just did it the old fashioned way. I kept multiple windows open all set on a different pennant with max bid entered just waiting for submit to be hit. When the clock hit 5 seconds I began my assault. I was hoping to get at least 2 of the 5 I was interested in. I ended up getting 4 of 5. Spent a little more that day than I was planning on.
