Only 50 docs per user on box.net

Google Reader (1000+): "Box, which has 6 million users and stores 300 million documents, is a cloud storage platform for the enterprise that comes with collaboration, social and mobile functionality."

That seems like a small number. I have many thousands of files in dropbox. I wonder if this lack of user intensity makes their offering less sticky than they would hope.  My guess that many of their corporate deals include many people who do not and never will use their system, but the headcount helps their vanity stats.