Where do you think you will find more info -- the DMs of a PR account or the someone's private alt? Or the DMs of a twitter celebrity or the DMs of a hedge fund manager or member of the board of directors of a bank?
I suspect that hedge fund managers and bank board members are considerably less likely to use DMs as a means of primary communication than Twitter celebrities. Private alt accounts would be very interesting, but you'd need to know who they are....