It might be because people conceive a loss more severely than a gain. There might be an evolutionary explanation for that. Because of that they would conceive their "lossed" card which they already thought would be theirs more severely than the card the "gained" after the cut. While you on the other hand might already be trained to think about it differently.
We've had these for a year, I'm sure we all know what to do by now.
This thread is for the discussion of Less Wrong topics that have not appeared in recent posts. If a discussion gets unwieldy, celebrate by turning it into a top-level post.