river bluffs

[gaming_mouse]

Villain was tight, maybe around a 1.5 aggro.

Waste of money on the river?

In general, how often, and in what spots, do you make river bluffs like this one?

Party Poker 5/10 Hold'em (6 max, 6 handed) FTR converter on zerodivide.cx

Preflop: Hero is BB with J[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/spade.gif[/img].
<font color="#666666">3 folds</font>, Button calls, <font color="#CC3333">SB raises</font>, Hero calls, Button calls.

Flop: (6 SB) T[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, Hero calls, Button folds.

Turn: (4 BB) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, SB calls.

River: (6 BB) T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>?????