E
Easyhooker
Rising Star
Bronze Level
Let's say you get into a large pot with KQ and you hit a pair on a dry board, like K42. You could be up against AK, AA, KK and you are way behind. If your opponent has something like KJ, KT, you are way ahead and it will be tough to get paid.
If you have AK on the same flop, you are likely only behind AA, KK. But since you already have A&K and the board already has a K, then these hands are less likely.
Higher potential for a straight does not really outweigh these factors.
It also depends how tight your opponent is. KQ vs a very loose opponent is stronger than vs a very tight opponent who tends to mostly show up with premium hands.