Guild Wars Stock Market

I was thinking about this, and it wouldn't be terribly hard, but here's the basic idea:

For each of the weapon skills, the qualified staff here a GWG decides what the most powerful weapon for that skill is, or finds a stat that can appear and be useful for every class. Then, once a week, someone goes and attempts to buy that item for each attribute. The price that they find most common is that weapon's "Stock value." As the price changes, people can see how popular certain types of weapons are, which also shows the popularity of some classes, helping Guild Leaders prepare for Guild vs. Guild battles.

If this idea catches on, it can be expanded to include the prices of dyes (at LA, naturally) or other items.