Quote Originally Posted by Blinky

I'm just regurgitating Fnord's post really, but I'm starting to understand. .. Theoretically anyways - why at higher levels "you play your most profitably when you play opposite your normal style". You have immediate deception due to your table image, which could make your opps make false assumptions about you - helping them make the wrong decision about your hand. They probably won't be making the wrong decision about their cards, so your edge has to come from somewhere else.
Yea I guess the point is that if you assume there is a theoretically 'correct' way to play any given hand in any situation then your profit can be defined as the difference between your mistakes (EV you lose) and your opponents mistakes (EV you gain).
It becomes obvious that in a game where your opponents are constantly making big mistakes by themselves, your profit is maximised when you play as correctly as you can and dont worry about mixing it up (i.e. bluffing, slowplaying etc.).

In a game where your opponents tend to play correctly you need to deviate from correct strategy so that they alter their play. You will make a profit when their forced mistakes are bigger than your (delberate) mistakes.