No reason this shouldn't be working for everybody. This gives me peace of mind that when I send out my credit card number on the site, if their negligence causes retail fraud, I can be certain what site is responsible for that number is linked uniquely to that site. I can easily disable this during periods when I am not buying products. Whenever I need a new prompt for a credit card number, I can easily re-enable it and I'm good to go. While it seems slightly convenient that I would need to sign in again, I am satisfied since it protects my credit card information.