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The PFA quality audit system is entirly diferent to the system used by the CAA and puts the responsability for the fitness of an item to be used on to the builder of the aircraft.
The system of inspectors insurers that the owner/builder has not fitted something that is not fit for the job.
This one off approach is OK for a cottage industry such as home building but is not robust enough for an industry that has to ensure the saftey of the paying public.
The fact is that most PFA inspectors ( like me ) give there time for free and if we charged the going rate then the cost of inspection of parts would not differ much from that of the CAA aproved parts.
If we wanted to continue on this road I might suggest that the aviation public transport industry is subsidising the PFA system by training a large number of the inspectors that the PFA requires to allow the homebuilders to enjoy cheap flying.