Hi there,
I'm only an occasional weekend angler and know very little about the financial implications of changing over to knotless keepnets etc. but it reminds me of the recent groove rule changes in golf clubs which has enormous financial consequences and like golf, perhaps the gradual phasing in of the new rules is the way to go?
Eg: Anglers fishing at international level adopt new standard immediatly. Provincial anglers have until end of 2011. Club anglers until end 2012 & weekend anglers must all use new standards by 01/01/2015.