Keyword here is making. A merchant doesen't really make money. They just manipulate and hoard it, contributing nothing to the economy. Someone who practice skills adds items and gp to the game, which is in everybodys interest. Exactly, the only ways to make money are: Sell to store, getting from coin drops, random events giving coins or alching. Other ways (mining, merchanting, woodcutting) are money moving How is mining money moving? By mining, you are effectively creating ores that were not there. If I mined a Runite ore, there would be one more Runite ore on Runescape, therefore creating money.