I agree it is a bit complicated.
Just make it a cursed form of doubler to negate unbreakable and sink some extra gold for the event.
We could tweak it so that it doesn't rely on Doubler, but instead of applying a multiplier to xp and gold, it will just apply it to the event contribution (and still multiply the stamina used in the same way Doubler works) - do you think that would make it less complicated?
Sounds Great to me, the cursed part was just an idea to sink more gold as well.
Thanks for listening to everyone and hopefully making this event great!