Legit and illegit nps are a matter of perspective anyway. If someone AB's a MP then sells it cheap, someone snipes it, resells it and makes a killing, are there NP's legit? Maybe, maybe not. The item was illegit, and they made nps from that illegit item, meaning that even if the nps were once legit, they no longer are... Oooh, deep. lol. But yah, when you buy "legit" nps, they are no longer legit because you didn't earn them yourself.
then illegit neopoints would have probably circulated around neopia many times, making all players... illegit? :O like when you donate to the money tree, people who take illegit neopoints become cheaters too? :S