Is the way I play this straight costing me money?

[gulebjorn]

Interpoker 25$ NL

Full table, has been weak-tight as hell, 6-handed pots being checked down and worse. I have tight image, I've only been at the table 3 orbits or so. Haven't called a single raise, only seen a few flops, only bet one of them and took it down, didn't call anything beyond the flop. I have 26$ to start the hand.

I'm on the button with KJo. Two limpers, I limp, blinds complete and check.

flop (1.25$): T [img]/images/graemlins/diamond.gif[/img] Q [img]/images/graemlins/heart.gif[/img] 9 [img]/images/graemlins/spade.gif[/img]
4 checks, I bet 1$, two folds, two calls, both weak-tight, allthough i've seen one of them show a tiny bit of agression a few hands ago.

Turn (4.25$): T [img]/images/graemlins/diamond.gif[/img] Q [img]/images/graemlins/heart.gif[/img] 9 [img]/images/graemlins/spade.gif[/img] 7 [img]/images/graemlins/diamond.gif[/img]
check, check, I bet 2$, one fold, one call

River (8.25$): T [img]/images/graemlins/diamond.gif[/img] Q [img]/images/graemlins/heart.gif[/img] 9 [img]/images/graemlins/spade.gif[/img] 7 [img]/images/graemlins/diamond.gif[/img] 9 [img]/images/graemlins/diamond.gif[/img]
check, I bet 2$, call

It's not spectacular, but I think a lot of profit/losses are made in these kind of hands.
Comments from preflop to river appreciated.