Phil Ivey River C/R vs sbrugby ($200/$400)

[CruNKinTILT]

I saw this hand a couple weeks ago, and I've tried to imagine the possible hands that Ivey could have check raised the river with but I really can't come up with anything concrete. I'm pretty sure that it is for value though I haven't watched his game enough to know his c/r frequency on the river. I would think that Ivey would get more value in the long run by just betting the river, but if he mixes value c/r's with bluff c/r's then it is probably good for metagame. I know we probably will never find out, but what do you guys think? Was this a bluff or for value?

Ivey is in the small blind

Full Tilt Poker
Pot Limit Omaha Ring game
Blinds: $200/$400
3 players
Converter

Stack sizes:
Button: $67798.50
SB: $42373
BB: $16996

Pre-flop: (3 players)
<font color="#cc0000">Button raises to $1400</font>, SB calls, BB folds.

Flop: 6[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/club.gif[/img] ($3200, 2 players)
SB checks, Button checks.

Turn: 6[img]/images/graemlins/diamond.gif[/img] ($3200, 2 players)
<font color="#cc0000">SB bets $2400</font>, Button calls.

River: 2[img]/images/graemlins/heart.gif[/img] ($8000, 2 players)
SB checks, <font color="#cc0000">Button bets $7800</font>, <font color="#cc0000">SB raises to $23600</font>,



This hand struck interest in me because I play PLO and NLHE, but can probably count on one hand the times I've c/r the river. I know it won't be +EV in the long run at the levels I play at, but at what limit do the players become aggressive enough for a river c/r to be used with regular frequency?