folding on the river vs unknown

[TStoneMBD]

sb is unknown, bb is 50/10/.9 245 hands.

is the preflop raise ok or is this one of the times when calling makes sense since i cant take down the pot? raising allows me to chop up the sb's money with the bb a good percentage of the time and im inflating the pot in position. is there a reason why calling would be better here?

preflop is a common situation, but id really like to know how postflop looks.

Party Poker 15/30 Hold'em (6 handed) pokerhand.org hand converter

Preflop: Hero is Button with 8[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/heart.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">SB 3-bets</font>, BB calls, Hero calls.

Flop: (9 SB) A[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, BB calls, Hero calls.

Turn: (6 BB) 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, BB calls, Hero calls.

River: (9 BB) 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>

Final Pot: 9 BB