Erm I believe it's because the new technologies come together so make the high end laptop expensive abit than before. Most new laptops with the GTX GPU normally stick to 6th generation cores, DDR4 ram, SSD and HD display. This is because there's no reason for you to buy a good GPU when you got a rubbish core or ram.

But i believe Dell's latest Inspiron 15 7559, is quite good for the price and spec.