Kishin Shoukan

Make the game subscription based. Bam, they just blew up everything.

They won't. Not outright, anyway. They pride themselves too much on being a "worldwide leader in free-to-play games".

However, the pets in Reboot are pretty much a subscription fee (since you can't really do anything without one, and Nexon staunchly refuse to put either pets or Water of Life in the Reboot Rewards Shop).

And they could always make other essential items, like say Mastery Books, or even any equipment over level 10, require Cash.