That's a good point.
And I'm not advocating only raising on the river with the nuts... there are lots of times when you should raise - FH with a flush on board, when you fell into a backdoor flush and you think opponent has a strong enough hand to call, etc, etc... But MOIST of the time, you're probably going to be calling. Also, it's often much better to check/call on the river than to bet/?, especially when you have a medium strength hand and you think your opponent whiffed a draw. It gives him a chance to bluff.
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