My least favorite bubble situation ($27)

PokerStars No-Limit Hold'em Tourney, Big Blind is t600 (4 handed) converter

Button (t1520)
SB (t5555)
Hero (t3135)
UTG (t3290)

Preflop: Hero is BB with K[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/spade.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Button raises to t1470</font>, <font color="#666666">1 fold</font>

Call 870 to win 2570 and get ITM. Button's certainly pushing a wide range, that I'm still almost certainly behind, and the 40-65% of the time I lose this I'm in 4th and in bad shape.

It's pretty clear mathematically that I shouldn't fold unless the button is unbelievably tight, but is there any merit to occassionally letting these go to preserve FE for when I'm able to attack?