In the past ~1.5 years at Acquia, I've seen a bit of info about how to do Drupal training at camps that may be helpful to others. Please augment with your thoughts.
There are a few models of training & cost going around the camp world.
1. Training runs at market pricing, and is arranged by a Training Company (w/marketing support of camp). Company keeps all (or most) of revenue.
2. Training runs at market pricing, is arranged & marketed by Camp, and revenue is split (some %) between camp & Company