What a friend, reporting his own friend strategy and ruining it. I feel sorry for whoever your friend is. As for whoever that "friend" is, may this become a lesson for you, don't easily trust anyone. But since we're at it, Golden Shock Bait also give way more Adrift Heart than using any item that can be farmed or bought in game. I don't think this is fair for free and low spender players. Because in game events like this supposed to be made for all players and not just the high spender.
As for the GM and all SEAL Staff, check for any possible loop hole before you make this kind of event. If you can't make an event without any loop hole that can be abused, It's better for you to not make this kind of event. Just use your usual event exchanging boxes without any ranking.