There is no one more cynical than I about the plethora of carp baits available today Neil. And yes, I totally agree with you that anglers are some of the most gullible folk around. For instance, some are so daft that they imagine you could fish successfully with bread or worms on any barbel waters in the UK, with no regard to other residents of that water
Leg pulling aside Neil, there are SOME rubbish boilies out there (I say that guardedly, in view of events on another bait based ongoing thread) but most baits from the big manufacturers will catch fish, especially so when careful baiting has the fish feeding with abandon. But...there are also some gems out there, baits that have stood the test of time and been proven to stand head and shoulders above the also rans. True (and this will horrify you Neil) these were mostly developed and proven to be winners in the field of carp fishing...but a good carp catching boilie will catch barbel just as well.
You really must get a grip Neil, stop frothing at the mouth every time the 'C' word pops up. Some of the best barbel fishers out there also fish for carp...and vice versa. Angling skills, watercraft and pure fishing ability are NOT things that are unique to barbel fishers, however much you wish it were so. Sadly, the yobbo mentality is not the sole preserve of carpers either...having fished different areas of our hobby for an awfully long time, I would say the scores are pretty even on that one too.
As for Trefor West...he made his name long before crayfish were a major problem in general. My local water has ALWAYS had native crayfish present...but they never caused any problems, to the extent that most anglers were not even aware that they were there. You could happily use the mass maggot/caster/hemp baiting method that was one of his, and certainly Tony Miles favourite methods back then, without a single problem from crayfish. In fact you could do so up until fairly recently on my local...but you most certainly can't now. It would be a huge waste of time and money on the particular stretch I fish, and have you pulling your hair out in frustration. The same goes for many stretches of the Kennet and other classic barbel waters in my area.
Fact is mate, you will need to go through a whole new learning curve if the dreaded crays reach your neighbourhood. And they probably will, sooner or later. You may well then end up being very grateful indeed for a handful of specially hardened boilies...and various other aids developed by carp fishers
All the best Neil,
Dave.