I've pretty much weaned myself off of proprietary and commercial software anyway, but I still use windows on a lot of machines, and I don't pay for the privilege. I think it's worth pointing out, however, that while I never payed anything for any of my windows licences, I didn't pirate them either. I just reuse product keys from discarded computers or systems which have been updated to newer OSs.
There's really nothing wrong with that as far as I'm concerned.
