Im not sure a profit occurs so often without bluffing some and of course you dont know the oppositions cards so theres always going to be guessing as to if the position is strong enough anyway. Isnt it always the case that your good cards is only relative to the other players, so its impossible to judge precisely.
As it is, it is always mostly about playing with each other's mind if I am correct. I have never played poker myself though, but I have read few things about it, and from the look of things if I am to play poker actually, I would prefer to be having a strong hand when it comes to the card I am holding than to be relying on bluffs that could backfire eventually. One way or the other, the both of them will always get to come in handy as it would give you an edge when you are actually being dealt good cards at the end. Even if you have to bluff at all, you need to be able to know when to be going ahead with it.
Sometimes bluffing is also a good strategy for specific high risk moments when there are high stakes on the table or to provide more strong looks against oponents.
I would say poker has a lot of things to do with how a player can actually end up making an opponent to think what they want them to think to their own favor but it still takes a whole lot of skills to still be able to do it right. Personally I would prefer playing with only good cards as that at least would even give you a better chance but we all know everything is basically more like a game of luck anyway, so one way or the other, it is how lucky you are that would determine if you will be leaving the table with an empty pocket or a full one.