[AustinMike]

I can think of 3 reasons why they might have made the bid.

(1) They want to get as many copies of that card in that grade that they can. (I seriously doubt this is why they did it because they weren't very aggressive in their pursuit.)

(2) They wanted to drive up the cost of the card to get it in line with what they paid a month earlier. (I doubt this is why they did it because they didn't bid nearly as much as they did earlier.)

(3) They wanted to get it at a low cost to help average down the high price they paid earlier. (Like Ben, I would bet this is why they threw in their last minute bid.)