Never heard about the event where everyone that entered it, also won something.
Its about finding who is the best and awarding him accordingly.

I can mention you in the quest Epilogue, other then that, without some wins and points that will set you on the higher place on the duel table, I really can't see why I have to give you something for ''just because you entered the event''.

Duel, win, earn your victory... That's how events work my friend.