This is not to glorify profit. Like sex, the profit drive is subject to abuse. When profit overrides individual rights as in fraud or force, obviously the social fabric is torn. The mugger in Central Park, for example, is obeying his self-interest but to the detriment of his fellow man. But in any free exchange both parties profit or expect to profit, else the exchange would not take place.
Advantage is two-way.
Gain is mutual. Moreover, it invariably involves service to the other or others, and it is immediately reciprocated. It is, in this sense, the Golden Rule in action. The profit motive is also a great civilizer. It promotes not only civility and individual responsibility but division of labor and specialization, social cooperation and still more exchanges.