Much easier: Install any Linux distro in VMWare/VirtualBox, and use the CLI to download and install the dropbox daemon. Rinse and repeat. This only works for the CLI installation.
I went from 2.2GB --> 10.2GB in a few days doing this during my break.
This is also very much against the Dropbox ToS whereas the google adwords method is at best 'grey area'. I brought Dropbox more than 10 new customers. You didn't.
And might get banned for it... thats blatant referral program abuse..... it isnt "free if you are clever" its "free if you bring us new people in the door"
I went from 2.2GB --> 10.2GB in a few days doing this during my break.