I've just installed MorphOS on Mac mini of two friends (ex-amigans, now on Mac).
First, they said : it's fast !
I demoed MPlayer, OWB, Open Arena and others stuff. All was working nice and fast. But the time limit arrived and so the system slowed down. I have explained it cost 150 euros for a keyfile. And they both said it's too expensive.
So here another exemple of people (outside of our community) more or less interested by MorphOS but which won't register because of the high price.
Obligement - L'Amiga au maximum
http://obligement.free.fr