[Carmine]

He called the turn C/R. He either wants to go to showdown or is chasing a draw. I think against your "normal" PF 3-betting range opponent this is an easy bet on the river. You know he didn't 3-bet AK so that only leaves PP's that would like a showdown and will see it as cheap as possible or AQs that you are not getting a dime more from.
Now with this players range being larger and his bet(draw) when checked to mentality the "check the river" to induce a bluff becomes closer, but I don't think close enough to risk it getting checked through. As we extend his range to AT/9/8(for the induced bluff) we must also extend it to 66-22(for the would like to see a showdown cheaply)...I think. We also miss out on any (although slim) 3-bet opportunities.