Rivalry History
Sure, you might hate that team that's been in your league for the last four seasons, knocked you out of the playoffs twice, and provided a great target for revenge when you were drawn against them in the tournament last year. But without a rivalry history, do you really know what your historical record is against them, or have quick links to every game your two teams have ever played?
Not a major issue, but rivalry history is listed as a supporter feature. As far as I know, it is available to everyone. You might want to take it off the list, especially with the (hopefully) increasing attention supporter will be getting.