[theWeezL]

Its cool, Im human too it seems.

as for the topic:
Well there are other things important in the construction and function of a spark plug that are just as, if not more, important than conductivity. Things such as heat dissapation, heat resistance (melting point), erosion and oxidation. Its also not just about the materials used but how they are used together and the design and shape of the plug. These properties affect the way the mixture is ignited, the longevity of the plug, cylinder temperatures, and a variety of other variables that while I admit are nominal differences, are indeed what separates the good from the not as good. Its like cables and wires to audiophiles...do the expensive ones make a difference? To the audiophile they do.
Its like you said, if the only thing to worry about was conductivity then we would have plugs made of silver. But its also like I said, wait a few months something new will come out.