Huh? People leave games due to cheaters. Are you trying to say that benefits them? To them it's 1 less potential customer. They also ruin the market, though by now it's beyond repair. You have epic pot scrolls selling for 25m-30m a pop which is great but it lowers the value on so many items. They also take up loads of maps and training spots.
Banning hackers doesn't benefit Nexon in any way, it's actually the opposite.