Oh I agree, many of the American retailers are so far up their own flue it is unbelievable; and some of the German retailers break all the rules in the book and refuse to sell into the UK, which is against every EU law in the book !! Free movement of peoples and goods is the central pillar of EU law, especially trading - But still they get away with it !!! Grrr
Customs is another matter. Amazon US have a good scheme that bypasses customs (on some goods) but if we do ever leave the EU (pretty doubtful in real terms) then the cost of our FACs' will rocket - not to mention all the other goodies we personally import on the cheap from within the EU. I'm a Volvo man, and factory parts from Sweden, accessories from specialists in Sweden, Norway, Finland, Belgium and Holland all come in cheap because we're in the EU.
True of everything else many of us bring in personally.
edited for typos