Bad gains are truly losses.
Franklin argues that a gain obtained by bad means should not be regarded as a genuine benefit. Money, advantage or success may appear profitable in the short term, but if it is secured through dishonesty, exploitation or other wrongdoing, the apparent gain can carry costs that outweigh its value.
Those costs may include damage to reputation, loss of trust, legal or practical consequences, or the weakening of personal integrity. The saying therefore distinguishes between merely acquiring something and truly benefiting from it. A profit that creates greater harm elsewhere is, in Franklin’s formulation, a loss in disguise. The broader lesson is that the value of an outcome cannot be judged only by what is gained materially; the means used to obtain it and the consequences that follow also matter. Ethical conduct is presented as part of any sound calculation of advantage.