I gotta say, I have done this a rare couple of times in poker tournaments, only because I'm so close to being paid in the tournament that I don't want to risk losing to a subpar hand. Anyone else done this? Or if you haven't, what was the toughest fold you made in a game pre-flop?
I have done this on many occasions, A/K is in my opinion a vastly over-rated hand, Sure it is a good starting hand, good enough to raise pre-flop with, and it is one hand I would consider pushing all-in with, But! Saying that, Poker is a game of stages, and situations.
It depends on what situation I am in at any stage of a Tournament, If I was chip leader or at least in the top 5 positions in any tournament, I would be calling all day long, against a shorter stack, with practically any Ace + hand, but against a push from a bigger stack that could potentially cost me the game, then I probably would fold.
You have to judge each hand on it's own merits, and be aware of the outcome in certain situations, We all know from experience that even A/A gets cracked occasionally, So folding A/K is a consideration, depending on the situation.
When the fun Stops, STOP!