I love Dropbox, and I use it in exotic ways. That said, I don't "get" why Dropbox wants to be involved with my photos. I've balked at this, and I am surprised that Dropbox seems to be over-pushing in this direction.
Someone once said that 'Dropbox does only one thing, and it does that one thing VERY well'. I fear that this fixation on photos may be the juncture where Dropbox lost its focus, and ultimately loses the game.
As a succinct commenter posted on Dropbox.com: 'I don't need to post photos to Dropbox'.