because, pc's are shite, suck dog balls, are unstable, a have zero simplicity for trouble shooting, they have way less hands on maintenance that can be run by someone certified in trouble shooting that will actually "fix" dick, and windows users who think the Avid is somehow 'better' on windows are simply uninformed, uneducated, inexperienced with macs, and don't know shit about the difference between the two systems as far as speed, lack of crashes, lag of playback errors, corrupt media, we could write a book. the fact is your paying for quality, and when your a PROFESSIONAL PHOTOGRAPHER OR EDITOR you know this, because YOU HAVE USED BOTH SYSTEMS, and you use them DAY IN AND DAY OUT. To load the footage your loading when your editing on the fly into ram as you play down your system simply is something that a windows Avid will not handle as well EVER PERIOD EVEN THE TOP OF THE LINE NEWEST WINDOWS COMPUTERS SUCK COMPARED TO TWO AND THREE YEAR OLD MACS RUNNING ON AVIDS OR AFTER EFFECTS OR PHOTOSHOP OR WHATEVER. Y'all have a nice day now, and believe wtfe you want, your wrong. Period.