170 examiners are basically examiners in their own right (Especially where a flight IS required) and, entitled to charge as they wish. The CAA wouldn't care less about their accounting practises.
Do not underestimate what the CAA 'care less' about. Many an examiner has lost their status through 'paperwork oversights'. If somone is unfairly gaining a financial advantage on the back of their CAA staus, they tend to be very interested.
Of course, not that I am accusing anybody of anything. Purely hypothetical...