They've obviously done the math on what percentage of Mac buyers will subscribe to what tier of iCloud storage, times how long people tend to keep each computer

They've obviously done the math on what percentage of Mac buyers will subscribe to what tier of iCloud storage, times how long people tend to keep each computer, then priced the local storage options above that: https://support.apple.com/en-us/108047 https://support.apple.com/en-us/108047