That seems reasonable. If FA candidates show up for class, that means they have already agreed to work for the lousy compensation. If they quit before completing class, that means that something happened in the class that made them feel the deal was no longer worth it. That is a failure of leadership--a compelling leader would make them MORE eager, not less, to begin their new career.
Sure, some may have had no clue what being a FA entailed, but I'd wager that far more just wouldn't put up with the belittling personal treatment that our FAs are given. I know some people really need to be told that the company won't put up with any nonsense, but I do feel there is much room for improvement in human relations here.