I have a laptop that runs XP, I'm unlikely to upgrade it until it dies. I don't do anything on it that requires a newer OS, so not sure why I'd pay the $$ to upgrade until I get/need a new laptop.
I still run XP and 2k. I need it to support hardware that does not have a 64 bit driver. (It might be possible to run under win7 32 bit, but I've not tried.)