$55's... I wrote the book on FPS

[microbet]

Your reasoning is all good, but you will be mis-playing against:

People who (especially having checked the flop) will only bet or call a bet with AK or PP if they hit.

or

People who will call down some bets, and either wouldn't bluff or would only make a weak bluff.

or

flush draw.

But, you know all this.