What I was refering to is AK in early position (or blinds) facing at least 3 other players who will call with just about anything. In those cases I think a flop bet is a waste, but it's probably not a big deal.
I've been betting in this spot every time lately and it seems to work out well. Sometimes you have the best hand, other times you may make your hand on the turn.

I know you don't believe much in table image, but I think the PFR'r that ALWAYS bets the flop can get dividends later on when the flop does hit him. This is a chance to show the table that you are an 'action' player at little or no cost. I do think the low limit players are observant enough to notice this at least.

I check the turn of course if I don't improve my AK. Out of position you are basically handing the pot to your opp when you do this...