[dotBen]

The problem with these sites is that transferring large files is not really a problem businesses have that much - certainly not to the extent where they want to buy accounts on sites like this.

The people who do need this kind of services are independent musicians, folks wanting to spread underground music (dubstep, grime, etc) and warez. I've been known to dable in those scenes. There is no money in it, but people with skill who will try to subvert your service

I know from speaking to folks who ran the service you mentioned in your post that they were always fighting battles to keep the hackers out, the porn out and just dismayed to see their site being used to share music and other non-monetizable content.