Commandment No. 6: No Sale? No Profit

Editor's note: Jim Cramer's new book, Real Money: Sane Investing in an Insane World, is available in selected bookstores now. As a special bonus to RealMoney readers, we will be running Cramer's "Ten Commandments of Trading." For more about the new book and to order it, click here. To learn his "Twenty-Five Rules of Investing," click here. To read Cramer's first commandment, click here. To read Cramer's second commandment, click here. To read Cramer's third commandment, click here. To read Cramer's fourth commandment, click here. To read Cramer's fifth commandment, click here. Today, we present Cramer's sixth commandment.

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The game's tough right now. So tough that you have to be thinking, "It's just not worth it. When 50,000 people close accounts at Ameritrade(AMTD Quote) in a quarter, you have to know that you aren't suffering your misery all by your lonesome. ...