Revenue Concentration

A risk measure that a buyer will price in whether or not the seller brings it up.

Measures
Share of revenue from the largest single source, and the number of sources carrying meaningful revenue.
Data Source
The property's own revenue records.
Indicates
How exposed the earnings are to one decision made by somebody else.
What Moves It
A second real revenue route. Not a second trivial one added for the chart.
Does Not Prove
Stability. Two sources that fail for the same reason are one source with extra steps.
Status
Not applicable on this property yet. It earns nothing, which is a concentration of zero rather than a good score.

The same logic applies to traffic sources, and the two often correlate: one traffic source feeding one monetization route is a single point of failure wearing two hats.