While we are on the subject of retardation, i would like to pose a question to anyone who cares to listen.
In these games, the higher lvl the metal the higher level you must be to craft it.
In the real world, is it not the same process to make a sword/hammer/fork/insertrandomobject out of iron as it is brass? copper? steel? etc, etc, etc.
Why do you have to be 20 lvls higher to make a sword out of iron than one of copper?
Major flaw in logic it seems.
Harder, denser materials require more skill and higher temperatures to craft. Tin<Copper<Bronze<Brass<Iron.
Note the "Bronze Age" and the "Iron Age" for reference.
While I agree with the general idea behind your answer (different materials requiring greater skill to work with), hardness and density are not necessarily related. Also, copper is more dense than bronze, and bronze is similar density to iron (more or less dense depending on the copper:tin ratio). Additionally, bronze is less brittle than iron, and more suitable for making tools. The Bronze Age gave way to the Iron Age for two reasons: The "iron" in the iron age is actually low grade steel (iron with small amounts of carbon, and possibly other impurities, but the carbon is the important part), which is lighter than bronze with similar hardness, and low grade steel requires only a source of iron ore and carbonaceous fuel (coal, charcoal, bone ash to name a few options), while bronze requires copper and tin, which are generally not found in the same geographic regions.
Also, brass is more malleable than copper, bronze, and tin, and is generally not suitable for weapons, since it is fairly soft (it tends to be used ornamentally, or in for use around explosive gas, where the softness helps prevent it from launching sparks when struck).