Sorry, NYer, but that's not true. Any computer NEEDS anti-virus software.
Al, Al, Al...
For all practical purposes it is true! Virtually none of my fellow millions of Mac users ever use security software. Nevertheless, since the introduction of OS X in 2002, there has NEVER been a self-replicating Mac virus "in the wild". Yet, I'm told that there are hundreds of thousands targeting Windows PCs.
All of the supposed Mac security vulnerability rumors passed around in the Windows world are bogus or grossly exaggerated. Its smaller market share isn't the reason ["security through obscurity"] as you surmise; it's the core OS, Unix, that makes it so secure. MS Windows is so vulnerable because its core is DOS. It's that simple.
It's hard for Windows users, I know, to comprehend that a competitive system's security archetecture could be so superior, but it's true... and we haven't even gotten into simplicity and ease of use.
The bottom line is: for the vast majority of computer users that just want to be able to easily do the basics [email, web surfing, photos, music and home videos] Macs are far superior and vastly easier to master than Windows machines.
Just like BMWs, they cost more, but are affordable for most people when you also consider their lower long-term operating costs.
As for purchase price, the basic 21" desktop iMac system starts at $1199, complete:
For more information, I would direct you to www.apple.com