8 -> 16 GB RAM and 128 -> 512 GB SSD makes it $600 more expensive. A 512 GB NVMe SSD just doesn't cost $400 these days. Besides, why even use NVMe when a SATA SSD would be good enough for mac mini? I guess the only way to save money here is to get the 128 GB model and then use a SATA SSD with a USB adapter. $200 for extra 8 GB of RAM also sounds excessive although that's easier to swallow than the cost of the SSD. Finally, why is there no i5 (edit: quad-core i5) option? I think i7 is an ovekill for a mac mini, but i3 sounds like a very risky choice as it likely won't last more than a few years before becoming obsolete. I think it's unfortunate that Apple decided to "premify" the mac mini.