Opportunities for graft abounded, and "banana scandals" were a recurrent theme in the news. Some of Ku's co-workers allowed themselves to be wined, dined, and treated to prostitutes. Gambling was another frequent vice, and people at the cooperative were frequent targets of police investigations. Ku had no stomach for the shenanigans, and decided to quit.
回憶當時離開的原因，古德福說，光復後的青果合作社，雖然不像日據時代搞「口袋裡的數字」那樣黑暗，但暴利所誘，還是爆發過幾次「蕉蟲案」，許多平日吃喝嫖賭樣樣都來的同事被約談、傳訊，古德福看不下去，決定辭職。