
I once ran off with King's Quest 2 (gray box) while Collector was bidding on it aswell. That was ok though, since i wasn't the only one outbidding him.
I believe i accidentally outbid Almirena once too, forgot which game it was.
Most auctions i would just skip if i'd know somebody familiar intends to bid on it aswell but, for titles between 1980 and 1985, i don't make exceptions. I wouldn't be a collector if i'd let those opportunities just pass by.