For one thing, I have only heard of a few viruses that affect Macs, and they aren’t very common. Also, originally the Mac OS was highly visual and so an excellent tool for artists, musicians, and folks who think graphically as opposed to verbally. Over time, however, Windows has taken on many more attributes of the Mac OS so the difference is no longer as great. And besides, they cost more so you can make your friends think you are rich.