At 10nl, most regs have NO IDEA how to deal with 3bets and tend to raise w/ AK and KK+, call w/ pp's < KK, and lay down most stuff. They also tend to be weak tight post flop in big pots, so they play their cards face up. You can make a ton 3betting for value and 3betting light at 10nl, if you really know what you're doing.

Cuz they don't.

Gets a bit more complicated at 25nl+ imo.