Absolutely this is a very good point and often over overlooked. Plus I would argue that up until recently the whole file sharing industry was living by some fo

Absolutely this is a very good point and often over overlooked. Plus I would argue that up until recently the whole file sharing industry was living by some form of "illegal" filesharing (rapidshare, megaupload, etc). Systems like dropbox are most likely benefiting from the same idea but making the whole thing more "private" among friends and therefore making it less obvious. I still can't see there any substantial market in the filesharing area for normal users outside of the classic movie and music sharing. It is not like we are all now operating with music and video master files and need to juggle 1gig+ data files around.