When you spend all that $$$ on a Mac, you are just paying for the name. You can buy a much faster PC for less. What makes a Mac a Mac and not a PC is the OS and it's preppy styled cases. Apple will never be the #1 PC maker because of the snob factor assosiated with it. If you have an Apple, you 'have money' but if you have a Dell you are 'poor'. Apple themselves embrace the snob factor by locking it's OS onto one brand of PCs (which baffles me because if Microsoft did that they be sued all to hell!) and by over pricing their hardware. They don't even use AMD or low end Celeron chips... To them a 'budget' computer is a $500 little box that you have to provide IO devices for, eMachine's definition of a budget PC is a $300 computer that comes with a flat panle and a keyboard and a mouse. Apple also further embraces the snob factor with their iPod marketing. They've made having an iPod Classic or an iPhone a status symbol that clearly says 'I'm better than you' to anyone who bought the cheap iPod Shuffle or another mp3 player. I used to own an iPod until it died, and I liked it, but I didn't like running the risk of being mugged and killed for the damn thing, so my next one will be a Zune (again). Apple is basically like Sony... People assume the more exspensive thing is the BEST because it costs WAY more... So what makes a Mac a Mac and a PC a PC? A Mac is a Mac because it's overpriced and has no real games or software for it. A PC is a PC because they dare to run the worlds most popular OS and 99% of applications out there without issue, and because you, the end user, can upgrade it without spending massive amounts of cash on "Made of Mac" crap.
EDIT: Also a Mac is NOT immune to malware; hackers just don't feel it's worth their time to hack an OS that's used by 1-3% of the world.