free iCloud storage?

Why can't Apple offer additional iCloud storage to loyal customers?

Currently in our household we have 2 iMacs, 1 MBP, 4 iPads, 3iPhones, 2 Apple 2TV's and an Apple Watch with another watch coming soon. We have spent quite a lot of money over the years and it would be nice if Apple were to give something back such as additional Gb's of space for each product purchased.

This could be weighted based on the product purchased i.e. an iMac would get more space than an iPod.