I can't speak for them, of course, but I believe that most economists would accept the view that, while you sometimes can make a score by sheer luck, you can't do it constantly, unless you're willing to put the resources in.

Macroeconomics: A Neoclassical Introduction. ; R. Miller (1991).

He shared the Nobel Memorial Prize in Economic Sciences in 1990 along with Harry Markowitz and William Sharpe. Miller spent most of his academic career at the University of Chicago's Booth School of Business.