I too am hypocritical when it comes to this. But Windows is something I use everyday, and I certainly wouldn't run an illegally obtained copy. For the amount of ease it gives the average user, the cost is next to nothing. You use it everyday, and it makes your life easier. Like it or not, Microsoft did an good job overall and it certainly has made a lot of peoples lives easier. They may not be making the majority of their money off of home users, but that really isn't the point.
I pirate movies without thinking twice, because I only watch them once. I do pay a monthly fee ($10) for a music streaming service though, and I do buy most of my games. I think if you're going to use something everyday (and Windows in many cases helps people MAKE money) then you should pay for it. It's like stealing a television, you guys don't want to be eNiggers do you?