The Profession or Commoner Class it the oil that makes the wheel of the world move. Without the professions nothing in the world can be manipulated. It is how resources are gathered and altered and crafted into the various tools and survival items, as well as the luxuries that make the world worth living. Want to be an adventurer? How you going to battle without a blacksmith making you a weapon? Without an armorer making that platemail? Without a cook to prepare you some vittles? Without a weaver for the clothing and backpack for travel? All need to give to the world, or no one will make it very long.
See Also: Professions