If Nordeus sees that these accounts give them a substantial income that we may not know about, then I can see why they may be closing an eye and giving them a pass. Shutting them down will make these "costumers" angry and if Nordeus is somehow making a profit from them then its too bad for us honest regular players.
It sucks but I understand than in the long run players like me who just enjoy the game and give Nordeus the ad videos views are less desirable than those who pay, even if they cheat in association.
They should still take action against selling accounts since that is directly against their terms.