There's no reason for a Mac Mini to not have held its price since the 2005 launch
Compare and contrast with Intel NUCs and similar.
If they're hoping that people will buy a Mac Mini because of its operating system, they could at least put some effort into that as well. So far all that seems to change is an extra 0.5 GB of RAM required per major release.
But given that NUCs and Macs have similar hardware, NUCs are easily Hackintoshable.