You should bet the turn because you'll get quite a lot of hands to fold and your hand will be better disguised when you do hit it.
E.g. you have Ah 9h
Flop: Jh - Qc - 2h
Turn: 8s
You might be able to get your opponent to fold TT, 99, 22-77, AK and AT with a bet on the turn. Sure you'll get called by AQ/AJ or raised by anything better, but you'll hit the river enough of the time to take down a monster pot (roughly 1/3 if you count your Ace).
On a lighter note, check out these screenshots from the most insane maniac I've ever played in 5/10 6-max:
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