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Guild Wars 2 is on sale until April 13th. In fact, it's 50% off the
normal price! You should expect to see the price of tier 1 materials
rising as new players enter the game and attempt to level their crafting
disciplines. Hopefully this will cause copper ore to rise to where it
was pre Lion's Arch events.
If you're looking to speculate on the coming April 15th patch, I also recommend that you start buying any jewels that are selling close to the vendor price. I know a lot of items like that dropping in Orr that will surely rise as we learn more about jewelcrafting 500.
Just for general speculation in the future, it is often wise to buy items close to vendor price just for the hell of it. Many items this past year have risen to 500% the vendor value through intentional and unintentional patching by ArenaNet.