Corrected! Thanks for the heads up. I think I may have incorrectly used 1 billion rather than 100 billion in my calculation.
This is why we need a like button on our comments :)
Main reason why they buying 1080Ti is performance per hash or something around that
nVidea care because they made the Quadro series GPUs for these large data-tech companies. Heavy investments go into the research for the tech of these cards (being much further ahead of their time than any GeForce card) resulting in higher premiums to bring profits to them. With consumer cards demanding more each year (and nVidea fighting to balance against AMDs offering) the GeForce series is progressing far faster than the Quadro series, leaving a far smaller market than they need.
I completely agree with you though, this is abuse of power, forcing datacenters to pay the premium so the rest of us to get more competitive/affordable GPUs down the line. The problem is when a datacenter sets up shop, they'll need hundreds of GPUs. It's kind of hard to get an order of such magnitude past nVidea without them noticing, so it's not like they'll have a choice but to either pay the premium or take a look at the less-competitive alternatives.
Most companies will probably opt to pay the Quadro premium, as it'll be better for them in the long-run to be able to compete with other Quadro companies (and out-do those who chose AMD instead) than it would to lose shares with smaller/weaker datacenters. nVidea are profiteering out of this, nothing more. Just got to love shady business practices.
This year has certainly shaken up the CPU market, it's great to finally see some competition back in the market. Let's hope it continues.