Gaud's plan was only a few levels from being a masterpiece plan.
Apart from planning to weaken his opponents, Gaud's plan encompassed a lot more than this. During the past 2 days, he also traced the spending of the Berserk Gang and noticed it when they spent millions recently.
It did not take a lot of thinking on his part for him to guess that these spending was for countermeasures against his invisibility mystic ability.
He thought of other scenarios, but the main reason was definitely to counter his extremely rare mystic ability.
Literally every enemy that he faced who had time to prepare did this so he was not deterred. In his track record though, no matter how much his enemies prepared, he always came out on top.
In his years as a mystic warrior, he already mastered the art of taking full advantage of his mystic abilities to fight at his peak state always.