Back in the days when we had standardisation, there were annual meetings where Examiners discussed fees, now those don't happen. It is a free market and Examiners may set whatever fees they like, it may vary between what the market will bear to, if we set too high a fee we won't get any customers. Many schools paid Examiner's expenses so test fees may well have gone to the school rather than the Examiner or simply the Examiner received a token fee and the school made its money elswhere in the training. Independent Examiners are in a different position, but need to be competitive in order to survive. Maybe we have too many Examiners which holds the prices down.