Ofc it works, they are having a profit with all combined (mobile, old ips etc..) even if it was decreasing to Q to Q as they overmilked their audience. You have to analyze the big picture + korean giant companies are supported by their State too.
Look up how their economy works South Koreas, few families and vassals keeping everything under control. Many of the companies are top quality and are successful, even on the global scene, but nothing will change until their own government "cracks down" on them and the (online) gaming gamble industry for real. Gaming ones face no resistance or big enough rivals, their base is secure unlike their tech giants, those think long term.
There were talks about sanctioning mobile games and enact new law because parents of the kids noticed whats going on aka its gambling.
So where did they turn too as a fast cashgrab? Yea you guessed right, old ips like Lineage etc.. Nc-s higher ups live on a different plane since a long time ago, its all about profit,profit,profit or it always were, just the methods were a bit more humane. 
I think they wont support classic (real paches I mean, itemshop yes they will update that 100% and ofc koean classic is a different subject altogether) and shut it down instantly when its not delivering the $$$, be it from whales or players they dont care. Its a mistery to me how that contients (Murica) retail is still not shut down with those numbers. Its like a walking corpse sadly. EU retail beats their retail easily in numbers. 
Maybe its influenced by the fact, they dont have a new flagship and ppl like Aion in korea still or something. + it is like a joker card so they can pull something like "classic". "Remember this game?" we support it still, you can trust us. 