Haha. I know. The situation invites sarcasm.
But it's been a touchy issue for me at this corporation. Even the CEO has approached me for personal design work, and half of the requests are for charity. In the past, it put me in an uncomfortable position of potentially seeming unhelpful or mercenary. I'm trying to remain friendly because, honestly, this kind of thing bothers me, and when I'm bothered I have a tendency to be VERY direct--the kind of direct that's not good in a corporate workplace.
Frankie's Girl, you understand this situation from a designer's perspective. I go back and forth about even getting into this on a freelance basis. I have a lot going on in my work and outside lives, so I'm partly leaning toward taking a page from your book and just telling them, "Sorry, I can't do personal design work. I don't have time."
NumberCruncher--I love that site. Especially the post where he's asked to do design work for free, and his replies complete with logo and pie charts.