That $3,000 is for a quad core 7700K machine.
Yes, the 5k display definitely adds value - if you need a display. If you don't need a display, I don't, so it's a needless added premium to the price. I'd rather use a fraction of that additional $1,200 for better upgrades on my machine - like I did with my PC build - going from a 4-core to an 8-core, adding more ram or storage.
And here's where Apple has lost it for me: they will never release a Mac Mini (or mini-mini tower

) with the 7700K processor, much less the upcoming i7 6-core Coffee Lake, with 16GB of user upgradeable ram to 32GB, a flash drive with a second user upgradable flash drive slot, and an 8GB RX 580 GPU for $1,800 - which I, and many others, would likely buy. Oh lord, I'd LOVE that machine - especially with the upcoming 6-core i7 coffee lake processor. But, it'll never EVER happen. Apple executive blokes just can't fathom there's a need/want for such a machine. They do, however, believe thinner is better, less ports is better, and if you want something somewhat modular, you'll need to buy an Xeon variant and pay through the nose - because they're Apple.

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This is the part that fries me. Apple had zero problem offering the less expensive iPhone C variant - but they can't figure out a C variant that would be a hybrid of their Mac Mini and iMac line-up. It would be more expensive than their Mac Mini line, but less expensive than their 5k 7700K iMac.
An option they really need to make
Mac Mini (double height)
7700K processor (or i7 8700K in 2018)
16GB Ram (upgradable to 32GB - 64GB would be better)
Radeon RX 580 8GB GPU (BTO option to RX Vega 56

)
512GB Flash Storage (user upgradable)
Second Flash Storage slot (user upgradable)
2 TB3 ports
4 USB 3 ports
2 USB 3.1 ports
Ethernet Port
Audio-in/audio-out
Priced $1,800-$2,000
OMG! Take my money (pipe dream)