So even if it loses by half of a frame per second in one game, one that you don't play, you're not going to buy it? Interesting.
Why should I? Come on, GTX 1070 is meant to be slightly slower than new flagship card - GTX 1080. Not to mention that GTX 1070 is 16nm card, not 28nm like Titan X, huge leap between those two. You should really take a look how GTX 670 performed when it was released. For me it's faster overall or it's not. I don't accept things like "it's faster in some conditions". Not to mention that GTX 770 4GB version which is nothing but slightly overclocked GTX 680 released in 2012 is still performing very well. It shows how great that chip is.
Just to remind you
http://www.anandtech.com/show/5818/nvidia-geforce-gtx-670-review-feat-evga/6
Let me also remind you that it was the first time when GTX x70 card was based on 104 chip, not 110.
That's the deal between me as potential customer and Nvidia as manufacturer. They want my money? Ok, no problem, I want good product (fast GPU). They want to be greedy? Ok, they can be but they won't see my money. It's really as simple as that.
edit
You should take a look how "powerful" GTX 970 really is in new games compared to the GTX 980. It's not even 2 years old GPU and it already starts to perform like shit.
That's one of the reasons why I didn't buy GTX 970. I knew that it will start to perform like shit at some point and look, it's happening. GTX 1070 on paper also looks like a joke when compared to the GTX 1080 but I'm waiting for reviews to check how it performs.