I know this doesn't change the situation any, but IMO if you have thrown down FOUR DIGITS worth of US dollars to get a lens, good shipping should be free. I don't own my own company, and I'm sure there's a good reason they don't, but if I saw a person is repeatedly buying L lenses from me, I would do something like this as a sign of gratitude.
But I'd probably be eaten alive in the business world.