6K for three macs... yea right. i have a mac mini ($800) and me and my girlfriend both have macbooks ($1200 and $1100), which is nowhere near 6k.
i grew up with windows, i only got my first mac (the mini) in 2005. i just find the things i do the most, like music, photos, movies, browsing the web, maybe a game for chess, are nice and simple. not to mention the good looks of OS X...
and on a final note... if i really want/need to have windows, i don't need to spend $150 or what ever you said. my mac has boot camp, which will turn my mac in to a PC, all i got to do is buy a copy of XP.