Most times you won't, but a lot has to do with how it is shipped. I bought a frame from a store in the UK. It was shipped insured in a simple box and nothing was charged. I have also bought wheels with the same results.
Neither time it was shipped as a frame for sale and such.
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Arguing with ignorant people is an exercise in futility. They will bring you down to their level and once there they will beat you with their overwhelming experience.