My guess is they're moving towards the high end corporate market, which is where the really big bucks are. And to break into that market you need a sales and support team on an entirely different scale than what you need for the consumer market.
I hope that you are right. Where I work our IT department has banned the use of Dropbox because in theory it would allow sensitive data outside of the organisation. However, they've not been able to provide any kind of alternative. My team could in theory do this but the politics we'd need to wade through would be horrendous. If Dropbox were to offer a way to run their service entirely inside your own firewall (with support) then I am sure that my company (and many others) would happily pay huge amounts of money for it.
