I have to respectfully disagree, I think 100 more is fair for 64GB, and then 100 more for 128GB, I originally had a 64GB 6 Plus, and this time I knew I needed the max, so went with 6S+ 128GB.My view is that 16GB is enough for some but the other (like myself) need just a bit more and 64GB is way to much for the price increase. I think Apple should still do an 32GB option at half the price difference between the 16GB and the 64GB. But it's a good move on Apple behalf as I had no choice but to spend the extra for the 64GB.
Would be nice for Apple to make 32GB standard.