Originally Posted by Gzz
So, anyone have found which is the best ore to prospect for profit?
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That's really not a useful question; it depends on the price of ore and the price of gems (either raw, cut, or processed into dust, depending on what's most valuable at the moment). That means checking dozens of different prices to actually figure out what the value of each ore is - and all of the prices vary significantly between servers and over time.
On my server, the value (ie, what it's worth to me after I process it) of Obsidium is currently 140g a stack (trending downwards as green gems become less valuable), Elementium is 180g a stack (trending fairly flat due to blue prices mostly staying high), and Pyrium is 340g a stack (trending downards as Volatile Earth prices fall). So the most profitable ore is "whichever one I can find a farmer selling cheaply", and there's no way of knowing what that will be without hanging out in /trade and seeing what's on offer. In the last week or so I've bought and prospected all kinds of ore; there isn't (and can't) be a single answer.
There's a link a few posts back to a decent spreadsheet for prospecting, although you can easily make your own with a couple of minutes looking at Wowhead tables. Plug in the prices of your outputs to find the value of your inputs, add a hefty margin for risk and profit, and then buy anything cheaper than that.