Quote Originally Posted by bigspenda73
I invite you to tell me how their PF opening range is relevant in determining if we're raising for value.
Yes, their range in calling or re-raising a 3 bet is important. If all your 3-bet is going to do is cause worse hands to fold and better hands to stay in, it isn't a very good idea.

But their pre-flop opening range is also relevant. Because what you are doing with a 3-bet is putting more money into the pot. There are two ways this can work out for you: (1) if you create enough fold equity so that a hand that would have beaten you had it seen the flop folds, and (2) because you are simply ahead in the hand and are betting your hand.

Bear in mind, as a first level poker strategy, it is never a negative expected value play to put money into the pot when you are a statistical favorite to win it, as long as you get a caller. A lot of this discussion is obscuring this fact, but that doesn't make it any less true.