You can back these cases with 25.8 gazillion english Złoty if you like, but if I ever put a full-size desktop onto my desk it will be a genuine A3000 or A4000 case with a genuine A3000 or A4000 motherboard in it.
If I need an emulation going beyond what actual HW ever did, I'll just set up UAE somewhere, better, cheaper and just as "real" as Frankenstein-Hype that will soon blow over.
The general public might be mini-NES cos it's cheap and easy to use, if they are geeky they might get an A500 replica case as that the only Amiga they will remember.
A3000 was something very few outside ever saw or would easily identify as "Amiga" so the market for those case is limited by design.
