There definitely should be a distinction between a guest receiving a one off package and a convention exhibitor routinely shipping / receiving their goods for commercial purposes.

The latter are used to being five and ten'ed for convention like services such as being charged $200 a day for "electrical service", an extension cord duct taped down to the floor by an "electrician".

I thought I was smart having Amazon send me a small package when I was travel out of state to avoid sales tax but the fee wiped that out...