The single most valuable currency in the World of Warcraft game is gold. Just one piece of gold is equal to one-hundred pieces of silver and 10,000 pieces of copper.
Earning gold in gameplay is usually done via hunting, questing or crafting. When you hunt and kill, you can acquire whatever your enemy drops and sell it to vendors. When questing you can earn both money and items.
Through crafting you can create items to sell to vendors.
Typically in role playing games a lot of the fun comes from the challenge of having to attain certain levels of currency in order to purchase items or powers that you want.
