I am not a full time teacher, right now. I have had my own class twice, but with budget cuts, no openings, etc. I am back to subbing AGIAN!! I, however, spend $$ on a class that doesn't even exist!! When I do have my own room, it's worse. So... You know you spend "TOO MUCH" $$ on your class when you continue to spend for a class that doesn't exist!!! How do YOU know??