“Founded in 2007, Dropbox epitomizes the freemium go-to-market. Dropbox has grown from 0 to 500 million users over that time period. 2% of those users convert to paid and pay an average of $9.33 per month. 90% of revenue originates through self serve channels – an astounding figure for company that generated more than $1B in revenue last year.”
Original source: Dropbox S-1 Analysis – The King of Freemium