It's well known that the global companies charge more in the UK simply because they can. That has been going on since the 1980s. I'm surprised that you deny it happens. Levi jeans, for example, in the USA are about 25% of the price in the UK. Now if you want Levi jeans that is what you have to buy, there is no cheaper alternative and UK punters will pay the extra to have them. U.S punters won't.

As for importing the golf clubs from the U.S - once you add VAT and duty and cost of shipping your imported product is not going to be that much cheaper. But people do this already and make a living at it so not sure what your point is there.