The trading commissions will eat up all of your profits and professionals know that, so it's bad behavior.

交易佣金会吃掉你所有的利润,内行人知道这点,这是不道德的行为

耶鲁公开课 - 金融市场课程节选

That's unethical behavior because it -if you keep trading too much, then you cannot possibly make money.

这是不道德的行为,因为,如果你一直过度交易,那你基本不可能赚到钱

耶鲁公开课 - 金融市场课程节选