According to evolutionary psychologists, a full head of hair resembles youth, and good health, while a bald head is associated with authority, knowledge and /or social status.
It's a reaseon why the bald gene has survived for millenia.
It's a trade off; and in a culture that worships youth as the only kind of beauty, you could say that it's a bad trade. But I would play it for what it's worth.
While bald men may not appear as "handsome", fact is they are often regarded as older, more authorative, more knowledgable, and less "agressive" (that is, "kinder"). Awareness of this could certanly improve any sales tactic...