Bad all in vs Maniac? Or was this play +EV?

[Toddy]

180 person tourney. Villain made a 3x BB raise every single time he was first to act. Once I came over the top and he folded.

PokerStars No-Limit Hold'em Tourney, Big Blind is t600 (8 handed) FTR converter on zerodivide.cx

UTG (t9901)
UTG+1 (t8978)
MP1 (t6905)
MP2 (t15040)
CO (t8740)
Button (t12886)
SB (t2908)
Hero (t5855)

Preflop: Hero is BB with K[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">5 folds</font>, <font color="#CC3333">Button raises to t2400</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to t5805</font>, Button calls t3405.

Flop: (t11910) 7[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>

Turn: (t11910) 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>

River: (t11910) A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>

Final Pot: t11910