(LC) Plauged by a play I don't understand....

[Snarf]

I've been seeing this all the time lately...Can someone explain this to me?

(No sarcasm - I actually want to know the thought process behind it...IF there is one...)

PokerStars No-Limit Hold'em Tourney, Big Blind is t600 (3 handed) converter

Button (t4045)
SB (t4380)
Hero (t6575)

Preflop: Hero is BB with A[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, SB completes, <font color="#CC3333">Hero raises to t1800</font>, SB calls t1200.

Flop: (t3400) 7[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets t1800</font>, <font color="#CC3333">SB raises to t2530</font>, Hero calls t730.

================
I *KNOW* the guy outplayed me with his paired King-in-the-hole POST-flop...
...felt priced into calling his all-in...
(Should I fold there?..)

I only ever will make this play against a villain who I think will check/fold the flop *IF* he calls the raise PF and *IF* he doesn't pair.

I know that I get aggressive late in tourneys and the guy thinks to double up if he hits...but he loses half his stack when he doesn't...

So....
1/3 of the time he doubles up...
2/3 of the time he loses half his stack...

In all honesty - I want to know what these fish/weak-tight players are thinking.


Edit: I'm gonna start check/folding King high flops in these spots.