OK, I've been running absolutely sick for the last few days. I only deposited $50 on PS to play a few donkaments (I played on WillHill like forver, but it doesnt have enough good tables) , if you scope me I'm down about $24 after a good start then variance kicked in lol. Anyway, I decided to deposit another $100, won an MTT then decided to play 25nl for a while.

I ran pretty goot and since friday I'm upto ~600. I decided to take a small shot at $50NL. I have money on other sites, so don't berate me for bad BR management! lol

Anyway, here's the hand in question. Obv I NEVAAAAAR folding this, but is there value in raising river or is this just a call 99.9% of the time. I guess only flushes are calling if I push over - but villains line doesnt make any sense whatsoever for a flush. I guess what I'm asking is if only better hands call me if I raise and everything else folds then then there is no point right?

Villain is an unknown

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($39.65)
UTG ($26.95)
MP ($66.25)
CO ($46.40)
Hero ($123.95)
SB ($55.80)

Preflop: Hero is Button with A, A.
2 folds, CO calls $0.50, Hero raises to $2.5, 2 folds, CO calls $2.

Flop: ($5.75) 9, 4, A (2 players)
CO checks, Hero bets $4, CO calls $4.

Turn: ($13.75) 5 (2 players)
CO checks, Hero bets $7.5, CO calls $7.50.

River: ($28.75) 6 (2 players)
CO bets $10.5, Hero??