And thanks again Jabawocky. In fact I do understand you think:
When you realise the motivation is more about better education with science and the safety outcomes that delivers, then you might understand that profit is not even a thought let alone a motivation.
which is why I was sure you would respond in the manner you did.
If it's costing you money and safety outcomes are paramount, why not post all the course material somewhere free of charge? You'd save a heap, you could still run the course for those desperate to attend, but safety would be improved for those without the time or resources to attend the course.