Invoice Usage Billing Monthly for Quarterly, Semi-annual and Annual Products
The "SnapShot" Usage Billing actually is recommended only to the monthly billing cycle, but this does not always represent the reality of the some web hostings, for example now with new licensing of cPanel (pay per number of accounts, monthly).
For example. A new client signs a annual plan of reseller which allow to use 5 sub-accounts, but the client uses 100 sub-account in cPanel. Until the next due date (after one year), the web hosting company is paying for the client to use their own service. Its awful.
Therefore, the "Usage Billing" needs to generate recurrence bills (montly) to the services to anothers billing cycles (Quartely, Semi-Annually and Annually). So that there is no unfair charge for both the web hostings and its customers.