Investment advisers have an interest in getting clients to contribute the largest amount of assets possible. The more assets an investment adviser manages, the higher the fees, which means an investment adviser's sales focus is on getting new clients with large assets or getting his current clients to entrust him with more assets.
Broker/dealers earn different commissions for different types of investment products, which can make them apt to favor certain investments over others. And so long as an investment meets the client suitability objectives, a broker can recommend the product that produces the highest commission.
Thus, unlike investment advisors , Brokers can continue to profit off small portfolios, as long as investors remain active traders.