It's quite simple, really: I can't afford to buy most of the software I use *right now*, therefore I pirate it. I wouldn't have bought it anyway, and get a lot of experience anyway. This means that in the future, when I do have a good job and loads of cash, I can buy the software I learned to use now.
Hell, nobody is losing any money - I wouldn't have bought it anyway, and it's all copied/pirated from people that still have the original program.
To be honest, I think Microsoft should pay *me* money to work with their POS operating systems; we consumers do the beta testing for them, it seems...