$50max short (boring hand, but strange call from opponent)

[MediaPA]

So I basically just joined the table, felt like seeing how tight the table was. I have no reads.

Hero ($49.25)
SB ($8.95)
BB ($62.35)
UTG ($24.70)
MP ($104.10)

Preflop:Hero is Button with 9[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $1.75</font>, <font color="#666666">1 fold</font>, BB calls $1.25.

Flop: ($3.75) K[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $3.75</font>, BB calls $3.75.
Normal continuation bet. Figured to take it down here. Slow down if unimproved.

Turn: ($11.25) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $11.25</font>, BB calls $11.25.
OK, I've improved. Let's try this again. Called. Hmm, I might be in trouble now. I don't think he's on a flush or a straight draw.

River: ($33.75) 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $32.5 (All-In)</font>, BB calls $32.50.
No flush. Possible straights, better kicker, or a boat. Oh well, I made my grave. Might as well bet it.


Anyway, I feel I got fortunate because I found a weaker, possibly frustrated opponent. He flipped K5o, said 'WTF.' My thoughts were he had top pair, board kicker. Did he really expect to win?

On a serious side, would anyone call these bets from someone whom you have no read on? If so, logic please.