Lowest spec with 10 gig ethernet starts 900€, not all what I would call cheap.
Also, the power consumption does not seem to be all that low:
https://support.apple.com/en-us/HT201897
According to apple they idle higher(?) than the 2014 model, though this value seems to have not changed all that much in a decade. For example, 11W idle was a popular pc build in 2011 already it seems that this is still a common value.
Gifted to my dad 5+ years ago, he refuses to replace.
Anecdote: He thought it would be a great idea to clean up certain ports when I gave the mini to him, sprayed WD40 liberally. Then it was all wet and I suggested he put it under (2 ft away) a 60W bulb overnight. He's, well, my dad... So he placed a 100W bulb right next to it and forgot about it for an evening. The backpanel was black plastic and it melted into the mainboard. This thing refused to die, and will probably outlive all of us. Anything Apple post 2012 is yet another story at least for me.
Edit: still running, windows 10, 2 monitors