In the stat section under hub metrics, the revenue potential is given as ‘$’ for a hub which receives maximum number of page views whereas for some hubs, which receive only a handful of page views, the revenue potential is given as ‘$$$’ or ‘$$$$’
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Its basically the amount an advertiser pays for a single click - at least this is what I see it as. So, the hubs with higher paying keywords will have more $ signs than the rest
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