It's justified if people pay it.
>Nowadays I can buy a miniPC with a Ryzen5 and 32GB of RAM for around 400€, but the cheapest Mac mini nowadays sells for over 700€ and comes with 8GB of RAM and an absurd 256GB SSD.
So what's the problem?
If you like running Linux on your Ryzen5 miniPC with 32GB of RAM for 400€, you're more than free to do that. Apple's not stopping you.