There are always going to be exploits, every new feature in this game has been exploited. And no, 200% pvp payout would not pay more because there's no completion bonus. And how would ata lose money? You're just as likely to xstal a pvp chest as you are a crux
They had an item that did exactly what you described called the spectral lantern. (It gave the bonus to the whole clan) If they made the pvp weekend premium spell permanent and brought back an item similar to the spectral lantern then it would work perfectly. (Best of all they already have the code leftover so it's just modifying and re-implementing existing code
Dev now only think of making more money PVP, Dev will never make money , only HTE ,ZTA and events. So thick twice before u play KAW.