I think this is why they're doing it this way, at least they get paid. For Netflix it doesn't really matter which region a subscriber uses as long as they pay.
I think they just act against VPN use because the content owners force them to. They love trying to enforce their old borders in a digital world that has none. Personally I think they should be happy that users are going out of their way to pay for the content given how many alternatives are available. They even pay more for the VPN itself.
Really, how many users will go like "Oh blast, my favourite show is not available in my region, guess I better wait until someone inks a deal and allows me to watch it"?
Shows are worth disproportionately more in some territories, local broadcasters are also very good customers they want to keep happy and only license in areas covered by their transmission windows, basic things like the structure of the school holidays and weather make a tremendous difference when it's profitable to launch a show etc etc.
Just refusing to take someone's money and expecting them to wait until you will is not realistic. Even people that have worries about torrents will have friends/colleagues/nephews that are happy to produce a USB stick upon request.
In theory a single someone can share with another single someone but multiple households would be hard pressed to do so as it would be easy to exceed the number of screens preventing others who pay for the service from watching.
If you aren't already paying the extra $5 for 4 screens and UHD you only get 2 HD screens which is even more unsuited for sharing.