Essentially, because there is no signed contract or forecasting involved in this procurement method. After making the initial purchase, an organization simply orders additional licenses as they need them in the same way they would purchase the full packaged product. This makes it easy to use and to administer. The Microsoft Select program is a contractual program, where quantities are forecasted and committed to over a 2 year period. Microsoft Select is solely targeted toward larger organizations.
Price is determined on the total points accumulated during the initial order quantity.
Pro, and maintenance for each license, their total points equal 520. When ordering, the customer can use the same product number as the shrink-wrap product, then add a suffix which indicates their discount level. Minimum reorders for all levels must be equal to or greater than 8 points. If Maintenance is purchased on the initial order, then all subsequent reorders for licenses must also include Maintenance. It may also be purchased for shrink-wrap software, although this is not required.