This topic is raised on a regular basis and the answer is always the same. If it is a registered shoot then glasses are mandatory, not optional. When the rule is not enforced then you can easily spot the difference between a scorer and a referee. This rule is under the control of the person running the shoot and has nothing to do with the CPSA.
As far as 'naughty boy' letters are concerned, the CPSA is doing its job. Registered scores are to be handed in at the end of the shoot. Its in the rules. There is nothing preventing the shoot organiser submitting these scores having taken the information from the master sheets. Maybe they are scared of upsetting their customers who don't want to put in either a high or a low score for reasons best known to themselves.