This is screendump from one of our Wintel servers. It's online 24/7, last time I had to reboot it was beacuse of UPS change. It never goes down, I can replace it's failed discs on the fly. 300+ users, 80 printers and god knows what more. It costs as much as typical hi-end Mac and it can do sooo much more.
Frankly, I see Mac's as niche products. It's like comparing a VW Beetle or Toyota Prius to F150 Truck. It's nice and it has built-in flower vase but in the end, when you need something done, you use the truck.
The funny part is, Mac's are nothing more nowadays than styled PC's that boot OS X. There will always be a niche for Mac's (mostly for computer-challenged customers) but as somebody said before: if all Mac's stopped, the world would keep spinning as usual and couple of Art directors would be pissed.
If all PC's stopped....yeah baby....that would be a meltdown.