I think your brain fell out while your mouth was open.
The problem with your argument is the Macintosh commercials. They claim that smart people use Macs, and all historical genuises would have also; yet they stifle people from tinkering. Learning to use Linux is learning your computer at a level that the high profile OS's don't allow. Not to mention that Linux users fix bugs and release fixes faster than either Mac or Win(by far).
Anyways, if you want to run UNIX on PowerMac G3 hardware, shell out $499 The problem is I don't want to shell out $500 for a Mac flavored *nix that is not open.
Security? How about being able to examine your security code for backdoors? Can you do that with a closed or half open OS? Are you sure the folks at OS incorporated hold your security interests in a high regard?