@warpdesign
None if you bought your Mac in the past 2 years (cos that would mean x86).
But thats not the question, the question is how many OS9 app (or 68k apps back when PPC was introduced) were people running when the 1st switched to OSX ?
And that was with the Mac market being relativly healthy, a still functioning mother-corp actually investing into it etc.
On the other side, just ask any OS4 or MOS how far he would get without 68k-emu .... sure some might say "no problem", but only till someone had a deeper look into the actual system.
AROS has been going for over a decade now, and it still lacks apps for even some of the most basic task, resulting in virtually 0 real user which then discourages developers from building native apps.
An MP-AOS wouldn't even be compatible on the source level, so instead of a recompile (+ a few patches) we would talk about more or less a rewrite. Not very motivating.