Re: Ha Ha
People underestimate the complexities of even visa-free business travel. Currently as a UK citizen I can visit the USA under visa-waiver for business:
I can visit our USA office, but I can't do any work while I'm there.
I can sell UK equipment, but I can't unpack or install it or supervise local staff doing that.
I can train US customers and attend a conference or trade show - but I can't receive training without getting an educational visa. Try getting an educational visa to the USA for a one day training session at a conference!
And this is only my reading of the official rules, whether I'm allowed in depends on how the guy on the desk feels about Brits that day. Now imagine these same rules applying to Europe, and remember that this is the best case of "visa free" travel.