Influenced by ads like 'Make money sitting at home', 'Make Rs 10 lakh with just Rs 1,000', to YouTube influencers promoting 'pump-and-dump' stocks, a vast majority of small investors who mushroomed during the COVID-19 period are losing money in reckless overtrading in the market, cautions Dr V K Vijaykumar, Chief Investment Strategist at Geojit Financial Services.