My question about arrogance is the fact that I've been a trainer for adults and I am school teacher, and the leader's presentation drives me NUTTSSSS!! I keep sitting there thinking how I would redesign things so that it would be better and involve more people...
That was exactly my problem too. (I am not a teacher, but have worked in learning & development roles prior to having a family.....)......so I empathise, I really do...........its hard, because if you are "in the game" (of training etc) you probably end up focusing on their presentation faults, rather than the actual message!

You never know, maybe the solutionm would be to lose the weight that you want to lose, become a life time member yourself and then offer your services!

Best of luck either way!