Getty Images; Getty Images Stocks have rallied sharply in recent months, thanks in part to a boom in day-traders, who invest in the markets for fun, rather than professionally. Dave Portnoy, founder of Barstool sports turned investor has become the poster-child of day-trading which has helped markets skyrocket, and fuel fears of an inflating market bubble. Popular online trading platform Robinhood has surged in popularity and generated more than 3 million account openings this year. Several billionaires have criticized the army of Robinhood traders, with one saying that the boom will only “end in tears.” Markets Insider has rounded 5 of the best quotes from US billionaires on day-trading. Visit Business Insider’s homepage for more stories.

Dave Portnoy has become the poster-child of a surge

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