I don't use the GPL (and never have) because, like another poster said, it is less free. When I put work out there for someone to do what they wish with it, I don't think I should then say "oh unless you do xyz, I don't approve of that". That strikes me as hypocritical, and so I don't do it. I don't harp on anyone who uses the GPL, they gotta do what they think is right. But for me, the GPL was never a good choice for software licensing.

And before anyone says "someone can make a closed fork of your code and then charge for it", I am aware of this. I also don't see the problem. My goals when sharing code are to share my work and help others by doing so. If some company uses my work to profit, I still have accomplished my goals. Moreover, others can still download my original code if they wish and reap the same benefits as the for-profit company did. This is a great outcome. Everyone benefits, nobody is harmed. While this scenario is often used as an argument that permissive licenses are bad, I think it is a very poor argument indeed.