It would show what tickets, boards user is subscribed to and in case of tickets, how such subscription happened. See also #98.
would also be nice if the user could annotate at least the tickets with why they subscribed.
I often run into the case where I'm working on a project, find an inconvenience or unexpected-behavior, and file/subscribe to a ticket because of it. I implement a workaround, and months later when the ticket is resolved, I don't remember why I was subscribed to the ticket in the first place.