No, it will not change. You just have to purchase 1 MSN Premium subscription for all your computers.
Please check the Private Message below for the pricing details.
To sign up for a stand-alone MSN plan, you may contact our MSN Sales team at 1-866-205-6768.
You may also opt to sign up through a MSN PROMO pop-up that would appear when you sign in to MSN detailing the plans available for you.
Feel free to create a new post for any additional concerns.
Thanks!