To be honest and not being nasty I can actually see why it is useful for a international salesman.
With all these type's of things is all personal preference and if you like it and can afford it why not.
As shown on that other thread something like this
is all that's required or its digital equivalent if that floats your boat.
As long as you don't have one of
these to go with it I can't see a problem wearing a 5 quid special up to a a 5k special.