Akira, you make complete sense there. If I wanted an Amiga, I'd buy the Eyetch AmigaOne, no question. But If I wanted a G4 Mac and bought its software, OS, etc, why in the hell would I go with a small, shaky company that could never offer me customer service Apple could?
Stick with Apple hardware for the software.
As for running Amiga OS4 on a Mac, thats a great question.... :O