You are paying for the brand name, and sacrificing the ability to play games.
I knew coming here it would be a lot of "PC this" (which is immediatley dumb, as Macs ARE PCs) and "Mac that", but this comment is just too funny. For the record, you are paying for the brand no matter WHAT you buy. Even if you buy parts and build your own; Intel and Gigabyte boards cost more than cheaper names, and Intel and Gigabyte boards tend to be more reliable, and definitely have better support in my experience. But as far as durability, there's been no comparison IMO between the several dozen computers of various brands that I have owned: every single Mac has had a lifespan around 1.5-3x the length of any other box in our office (aside from our fileserver, of course). As always, experiences can, and will, vary. Which is also why I find the whole brand-whoring thing nonsensical. "Abortions for some, tiny American flags for others."
Also, Macs have been able to run windows since switching to intel in 2006. So no, you're not sacrificing games.