This game (karos online carat) has a fairly reasonable population and activity. Though it mainly depends on what server you join. If you join the Seron server, you might find yourself in a ghost town. The Asmaran server has a higher population. Cash shop-wise, you do not need to spend a fortune or money at all to become a competitive player. The cash shop is not implemented to give you an advantage in superiority but, more fixed to give you a decent, untroubled gaming experience.
In many cases, you will find yourself having to purchase a few vital items (karos gold) such as