I see a lot of haters here, but I tip my hat to Netflix.
Imagine if you were building a service and had trouble getting customers to pay their fair share. Netflix are making it easy for people to use it the right way. Its a gentle nudge in the right direction. They arent just blocking or banning the users. Its not everyone who has to pay more, just people who are already in the wrong. And for a discount of $3, thats less than a cup of coffee!
Is it that people are worried that they will unfairly be charged more or something?
Anyway, I think this is an interesting space. I wonder how many users are account sharing this way and how many are account sharing on other services.