[ajizzle]

I disagree. In the given situation, not reraising the flop is essentially giving your opponent a free card. If you don't re-raise, you're not maximizing your winnings. You need to put in this extra bet to cancel out the money you lose when the diamond comes on the turn. If you simply call the flop, you don't win as much when your hand holds up, and you lose the same amount when your opponents draw out. For this reason, you need to put in this extra bet on the flop.