[Smasharoo]

P. 88, SSHE:

You often make an important trade off when you raise before the flop. When you have a pot equity edge, your raise has an immediate positive expectation because you will win more than your fair share. But that raise simultaneously cuts your postflop expectation.

I suspect this is what he means.

It's probably better if you include the part where he explains why even still you gain more value raising Pre-flop. While KJo is just over Miler's cut off for rasing inthe BB, he'd laugh at people not raising AJo/KQo etc there.

I suspect the reason KJo is over his cut off range has more to do with variance than expectation.