Actually after the Space Race I canceled my paid subscription because +8GB will make the free subscription enough for me. I wonder how many other people did the same?
I hadn't really thought about this as an option, but I think it's an interesting thing to point out. My hunch is that not many college students actually pay for Dropbox's service as it stands, though. Not to mention, the main-main goal is probably user acquisition which this should definitely aid in.