Comment by rokhayakebe

Not too crazy valuation. They only have 25M users, which by most web standards is not "that that" much. It is fair to say every user is worth $40.00/year. Dropbox goes mobile and becomes a default backup/sync app on Android and Iphone, add $1B. Dropbox becomes the place where I dump all my data, my own API, and lets services have access to different parts depending on settings, add $1B. Dropbox becomes mainstream and reaches 100M users, add $2B, .....