If you read The Motley Fool, then chances are good you have a brokerage account. And if you have a brokerage account, then chances are good you've received unsolicited phone calls from one of your broker's representatives -- be it E*Trade Financial (NASDAQ:ETFC), Charles Schwab (NYSE:SCHW), TD Ameritrade (NASDAQ:AMTD), or Bank of America (NYSE:BAC), just to name a few.

In the video below, I explain their motivation for doing so and the one thing you should keep in mind when they offer advice.

John Maxfield owns shares of Bank of America. The Motley Fool recommends Bank of America and TD Ameritrade. The Motley Fool owns shares of Bank of America and TD Ameritrade. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.