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It's not like we didn't have that idea last year. And the year before. And the year before that.But good and well-balanced options like this aren't trivial to add.
Or maybe allow rich families to put on a Tournament run by the family rather than a realm; to make it easier to use, it could even bypass tournament grounds (at significant cost)... After all, I'm sure a rich enough family could make a temporary tourney ground pretty easily with enough gold. In addition, a tournament in your honor is a perfect way to flaunt your gold and it gets redistributed to other players.