Well, if you consider that the asteroids would presumably be made of more-or-less the same stuff as the Earth, only spread out in small chunks instead of lumped into one great big ball that we can only get to a thin portion of the outer layer of (like Earth) it's easy to see that there's a great potential wealth of minerals and metals in there. (No oil or coal, though, as those require organics in order to form).
If you're going to be quoting exact figures, though, then you probably need to be aware of exactly where the figure comes from. Especially if the figure is particularly surprising.
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I hope the front page would be utilize some graphics. See this image for AGI risks: http://lesswrong.com/lw/mid/agi_safety_solutions_map/
If there would be similar graphics which you can press on, that would be great.