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One of the original points Gleem made was that because income is muddled together, it is impossible to tell whether a new traffic stream or a different sales approach is working. Perhaps residual (for want of a better word to describe income which comes along later from various sources) should arguably be analyzed to be meaningful, but it would surely be valid and not especially technically challenging to separate "new" (conversions within a month (?) of signing for a free membership) income and subsequent income.
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