Multiple Subscription based inapp billing

Hi,

Want to use google inapp billing for multiple service subscription but am finding it difficult to manage the same. Below is the use case..Assuming we have a app that allows users to register for a monthly subscription of website analysis.

Each website subscription fees is say $1
so if a customer needs to use the service for say 10 websites how do we charge

Make him pay $1 subscription separate..this will create user experience issues

OR

Make a single subscription of $1x10=$10.. But this will create issues if the customer decides to discontinue say 2-3 websites. He will still be charged $10 for the subscription even though the liability is less.

ANy inputs on this or am i missing something completely here.

Regards
Krunnal