only retail investor do intraday trading and make losses in intraday trading . there is a margin trading 20 x 30 X margin if the capability of trading increase in multiple then can earn 20 x 30x but they can lose also 30x their return increases as well as risk also increases. from intraday retail investor can lose their all of their capital they can finish their portfolio in one day and next day no longer capital needed for the investment or any trade.