Would it be morally fair of Nexon to ban buyers/sellers of NX? I think not.

Again, this thread is not questioning the legality but the morality of the situation in the sense of level of reason. I never said the rule makes no sense. I said that banning for it being broken without being cautious or reasonable is wrong. There may hypothetically be some ridiculous law/provision in a suburb of say Nebraska which states that it is within a police officer's right to arrest you and throw you in jail for a day just for jaywalking with no cars in the near vicinity. That doesn't make some smart-ass cop actually doing that to someone an acceptable act. Does it?

If there were signs every few yards along the streets that jaywalking is forbidden, then yes, it would be an acceptable act for the cop to arrest you.