If Netflix applies the Canadian practice to the US, then each extra member subaccount would be about $7.50.

If Netflix applies the Canadian practice to the US, then each extra member subaccount would be about $7.50.

(By comparison, Netflix's cheapest tier in the US -- Basic With Ads -- is $7 a month. And in countries where the Basic With Ads tier is available and account-sharing also just rolled out, the pricing relationship is consistent there too: The price for extra members is a bit higher than you'd pay to watch Netflix with commercials through Basic With Ads.)

Who pays the password-sharing fee? 

Extra members have their own account and password, but their extra member "slot" is paid for by the account owner who invited them to join the existing membership.

Since the model creates separate log-in credentials, it isn't really password sharing anymore. (Netflix uses the term "paid account sharing.") But the main account holder will be the person paying for both the regular subscription and the new subaccount.