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Don't forget the churn factor.



The figure to measure is 'retention'.

When cancellations equal signups (in this case 10 per day) you will stop growing. With the 10 signups per day as a base and a retention of 6 months on average that would mean that you stop growing after about a year and you'll end up with 1800 active accounts at that point for $36K per month in income.




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