Sure they are!
But. . .they get a fee, whether stock goes up or stocks go down. . .whether people SELL or BUY!
What a HARD life!
Actually, I believe that the fact that they get a "broker fee" in ANY transaction is enciting the ups and downs of the market! If the market was very stable, there would be very little reason for anyone to buy or to sell. . . so the "broker's fees" would be few and far between!
But, when the market is all over the place, most people panic, or overreact, and they jump on "buy, buy, buy," or "sell, sell, sell," which brings "fees" either way! Could that be a conflict of interest? Especially since most people (especially small investors) get it totally wrong! They tend to sell when the stock goes down, and buy when it goes up. . .
Totally counter intuitive, but ver welcomed by Wall Street!