Lim Goon is done with maple.

That seems to be the reason he quit more than anything else imo.

And it's a wise decision in retrospect since Chaos RA bosses can now only be defeated once a week once the KMST patch goes live. Imagine working your ass off fighting all the bosses and spending months on end funding yourself without real money in only to not get a single reward for your efforts.

If at anything I'd say it sealed the deal for him to quit.