In this example, you invested $100 to get a $1,000 return. $99 of those investments failed, but the one that succeeded made up for the losses. You still have to

In this example, you invested $100 to get a $1,000 return. $99 of those investments failed, but the one that succeeded made up for the losses. You still have to factor in the losses, otherwise if you could have just picked the winner from the get-go, you would have done that and invested just $1, not $100.