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BUT it is however, illegal to sell, manufacture, display or store them.

Wow, and double wow! Do you mean it would be illegal for me to store a box of American receptacles in my own cupboard? Or does this apply only to shops?

As for displaying, what if somebody wanted to put up a display board with a "This is what's used in America" banner? Would that actually be illegal?

Sven's point about old radios is a good one. I too have quite a lot of 120V electronic equipment, and I use NEMA connectors. It seems the logical thing to do, and a proper NEMA 1-15 plug an old American radio adds to its authenticity as well as preventing nasty accidents with 220/240V!