It is based on the premise that meso purchases and sales are transactions between users.
I don't think it's meaningful to calculate Maple Point costs or meso values later, so I'm only calculating based on the current standard.
The Maple Point = Cash ratio is approximately 5:4.
15,000 Maple Points = Approximately 12,000 KRW when purchasing mesos and using the Meso Market based on Croa server.
Rewards when using 5x = 5 Sol Erda + approximately 45% EXP at level 260 + 10 Gold Coins (350M - exchange cost 3,000 Maple Points)
10 Gold Coins are 8,400 KRW, and 3,000 Maple Points are approximately 2,400 KRW = 6,000 KRW
In summary, you get 5 Sol Erda + approximately 2.7 Extreme Growth Potions worth of EXP for a cost of approximately 6,000 KRW.
24,000 KRW per month = approximately 20 Sol Erda + 11 Extreme Growth Potions.