Comment by old-gregg

Make it something like $400/user. Having been an insider of 3 "Internet startups" in the past, I am assuming a 1:10 ratio of real active users vs total number of accounts in the database. BTW investors always asked us about the number of active users, followed by a question of "how do you define active"? Something like "logged into his account at least once within last week" is considered a very good measure of an active user.