4/180 FT Good line vs weak betting?

[MatteyA28]

PokerStars No-Limit Hold'em Tourney, Big Blind is t2000 (6 handed) internettexasholdem.com

SB (t27828)
BB (t54605)
UTG (t22455)
MP (t32881)
Hero (t45032)
Button (t87199)

Preflop: Hero is CO with 7[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to t5000</font>, <font color="#666666">1 fold</font>, SB calls t4000, <font color="#666666">1 fold</font>.

Flop: (t9500) 9[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets t2000</font>, Hero calls t2000.

Turn: (t13500) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets t4000</font>, Hero calls t4000.

River: (t21500) K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets t8000</font>, <font color="#CC3333">Hero raises to t16000</font>,