Originally Posted by badgers
Someone who is loose preflop is more likely to be loose postflop. This is not always the case but as a general rule that we can apply to unknowns I think it's fine.
Preflop his range is weighted away from As because he is so aggresive I would expect him to be raising almost any ace. I'm not saying we should take aces away from his range but they need to be discounted here.
I would expect villain on the river to have single pair hands/air a lot, as well as thing like lolplayed sets/two pair.... basically he has a very wide range but the way it's played I would expect this mostly to be a weak pair/air. While we wont get any more value from his complete air hands, I don't see calling this river with our "bluff catcher". Had villain bet something like $6 I would call, but this bet is so weak we are losing value from his weak pairs by not raising. Villain may well talk himself into a call with even a pair of twos because he bet so small that he may see us as trying to bully him off the hand.
Edit: Here's a thought... If he checks to you here would you vbet?