Here is what my friend (semi-pro for 8 years living royally off of poker) had to say -

Preflop usually reraise. On the turn he says he'll sometimes fold. You know villain has high cards (he'd bet all smaller pairs on the flop) and he doesn't have the J so the Q is slamdunk in his range. On the river it is stupid to raise over the $9 bet, what worse hand would he call with? Pretty much nothing. A raise is acceptable if he had bet smaller on the river, but he already bet pretty hard. He'll only have AK the way it is played so easy fold.