We don't charge anything for three primary reasons:
1. Because we can. We pay no rent or utilities.
2. Because we don't want to create any, even the slightest barrier to people training.
3. Because we don't want the hassle or the legal baggage of accepting payment for teaching.
We're organized as a club. It's cooperative. The membership pitches in and gets done what needs to be done.
Recently, the membership, Myers Sensei and I abstaining, voted to start taking up a voluntary donation with a suggested minimum amount. It's working out pretty well.
I don't have a problem with people charging for training or even making a living off of it. It just doesn't suit our very special situation right now.