check-call river to induce bluff and/or minimize loss? or is this like top boat and quads... you're going to get stacked unless villain is a super-rock?

i had 170 hands or so on villain. his win sd when raise river was 100%, but that's not necessarily siginificant over this number of hands. villain had been showing down some janky hands, so up until the river i figured he had the Q-high flush and couldn't get away from it. also, i thought the river raise might be due to him erroneously sensing "weakness" with my smallish bets.

thoughts?

Full Tilt Poker
Pot Limit Omaha Ring game
Blinds: $0.50/$1
9 players


Stack sizes:
UTG: $39
Kuso: $106
MP1: $218.80
MP2: $34.90
MP3: $301.80
CO: $98.30
Button: $140.35
SB: $95.35
BB: $40

Pre-flop: (9 players) Kuso is UTG+1 with
UTG folds, Kuso calls, MP1 folds, MP2 calls, 2 folds, Button raises to $5.5, SB calls, BB calls, Kuso calls, MP2 folds.

Flop: ($23, 4 players)
SB checks, BB checks, Kuso bets $11.5, Button calls, 2 folds.

Turn: ($46, 2 players)
Kuso bets $23, Button calls.

River: ($92, 2 players)
Kuso bets $40, Button raises all-in $100.35, Kuso calls all-in $26.
Uncalled bets: $34.35 returned to Button.

Results:
Final pot: $224
Button showed 2h Jd 7d Th
Kuso mucks 5d Ad 9h 2s

I put this in the top boat versus quads category. If I have the nut flush on a non paired board, I will go broke with it without regret. However, it is noted that I play at the low end tables (PL 100 and down) where this is +ev. At the higher end tables, where people dont go broke with K or Q high flushes (as much), this might be different.

Tom