I'm a Dropbox member. I pay $100 a year for the privilege. I use it because it integrates well with my desktop OS and several apps I use on my mobile devices. I

I'm a Dropbox member. I pay $100 a year for the privilege. I use it because it integrates well with my desktop OS and several apps I use on my mobile devices. I'm still on the waiting list for Mailbox, but I'll happily fork over another $100 a year to use it. A portion of Dropbox's customers have grown accustomed to paying for the service. I believe those are Mailbox's future customers. Mailbox should be a premium add-on to Dropbox. Even if the Mailbox add-on is priced at $50 a year, if only 1 million of Dropbox's customers subscribe and they stay with the plan for two years, Dropbox will have recouped its investment. I believe that providing features like this add to the Dropbox brand. It's about adding infrastructure that the OSes are leaving at the wayside. In the same vein, I would like Dropbox to add RSS & and photo/video/music sharing backends that client apps could tie into.