So the situation here is indeed interesting - I understand your concern. I've asked all the other core contributors to Django their opinions on this and there's been resounding support from them, so that's not a concern.

I also have a day a week free for this, so there's no concern of this robbing income - that day a week was previously used for learning to fly, and now I'm done with that it needs to have something that pays in order to keep me going. If the choice for that is freelance or open source work, and they pay closely, you can bet I'm going for the open source work.