Like in other platforms where articles or content posted is subjective to one's pov, answers in musing too are "subjective". What might be "bad answers" to you might be sufficient to the one asking the question.
A good example for this would be someone asking how to improve Musing.
One could write 5 paragraphs as to why Musing is already great now and needs no improvement and one could write a one sentence suggestion.
To most people the "one sentence suggestion" could be treated as a bad answer but it's exactly what the poster need for, a suggestion. Thus he gets more upvote.