Solin stands out from the "how to invest" crowd because he is a securities arbitration lawyer. He has seen first hand the portfolios and lives destroyed by unscrupulous brokers.
One of the cases he has come across is presented in this post from Arianna Capital Management. The Salomon Smith Barney broker took a conservative portfolio of muni bonds and used it as collateral to buy stock on margin. In the process, he lost over $2.0 million for the client. The interesting point is that, for an account that had an average value of $3.6 million, "...the brokerage firm gained $1.3 million (in commissions and margin interest) for “managing” this portfolio." Although admittedly an extreme case, Solin points out this is how wealth is transferred from clients to brokers.
It is also well worth noting that the $1.3 million portfolio would have been worth in excess of $5 million, on a conservative estimate, if it had been managed with low-cost indexed funds.