Retailers abuse their licenses by selling to the general public. You can get the license to import any replica firearm but only for the intention of media such as movies and reinactions. Selling those guns to someone who does not have the same license is a crime.
Not like I'm complaining about the fact we still can get all metal guns, but its no business that I'd like to get into(again). But thats why airsoft is so much more expensive compared to the south.