While I am on the wrong server, and am not a fan of 1-vs-1 Ballista matches personally, I fully support the promotion of Ballista in all forms. I'd love to see another Ballista Royale Tournament. (I started playing shortly after they took place way back when). I would Ballista every chance I got, if only I weren't too lazy/antisocial to shout for people for official matches/Diorama matches. Some of the most memorable moments I've had playing this game were in Ballista. If nothing else, just boost the reward you get for completing an official match in a way similar to the boosts that Beseiged and Campaign Battles have received. And maybe cut some of the less popular caps (like 40 and 50, from my experience), and replace them with the more popular (as of a couple years ago, of course) 60 and uncapped official matches. More opportunities to Ballista during a given Earth day might help to increase attendance.

Good luck with your tournament, and may the cheapest best man/woman win!

P.S. - Really, I just want a Stars Cap.