You financial gain by selling the borrowed stock at an increased price and subsequently shopping for it back in a lessen price Should the stock price falls. As an example, the current fee for your stock loan of GameStop Corp. (NYSE:GME) in late January 2021 is 31% to 38% https://financefeeds.com/k-e-l-s-dwight-foster-found-guilty-of-13-million-forex-fraud/