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Now is the time to buy Silver ore before things really get out of hand. Already rising in price from 50 to 90 copper in four days, Silver is likely to continue until it reaches the 2-3 silver mark. That's my expectation anyway, which would make investing at 90 copper a no-brainer.
As with any speculation, understand that this is a guaranteed method for making gold. There is always risk, and you need to be able to live with the risk. Also understand why Silver is likely to rise:
Silver, Gold, Platinum and Mithril are likely to be used to create the material for Ascended Jewelry crafting. People leveling their Jeweler as well as creating this new item (think something similar to Deldrimor Steel or Elonian Leather Square). The patch on January 28th 2014 is likely to introduce the new Ascended Jewelry for crafting.
Have you also invested in Silver, Gold, Platinum and Mithril? Well you should have by now.
Get investing people... your time is almost up!