There are probably a lot of people who can and do pay for upgraded machines, and for them 64 GB of RAM or an 8 TB SSD might be reasonable. (OK, I'm not so sure about the 8 TB storage tier…but there are probably a number of people who'd like the higher capacities.)
I’m very happy about the 8tb. itunes media has proper bitrates (looking at you google with your “4k”) so having your entire media library with you is a nice benefit as well as having some room to grow. i’m currently sitting on about 2.5tb of media and ~500gb of user data. buying a 4tb would max me out in a few months after buying more movies / shows.
My company is talking configurations for all next summer's upgrades... top i9 8-core, top 5500/8G GPU, 64GB of RAM, and 1TB of storage. Someone may up their storage, but I'm mostly insanely happy about the GPU and RAM.
