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Average: Some sites do better than others...
The math is based off the long term retention ratio. It's the entire life span of the site, after it has had at least one full year to cycle over its rebills, basically double stacking them.
So if you add the total sales and rebills income and divide by the total number of sales minus rebills, you get the join value of the site. The more time that is added in, the more the join value is, assuming the site doesn't blow ass.
It can be skewed too, if a site only takes in a few sales but built a large rebill base, as time passes without sales the larger the skew will be. So you run the stats from the drop point, and back... If you re-fire a site back up, it could skew it's 'new real' numbers, so it's best to reset your starting date.
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