I'm not much of an answerer, but lots of the questions have only one answer - I'd imagine that a stack of answers have been written by a handful of people.
I'm not sure about the reasoning behind this, but apparently 2.5 answers per question (I guess 2-3 answers for each question?) is a healthy target - I'd think it'd have something to do with answer quality or something.
I think legal questions more often than not will lend themselves to multiple answers which may be as valid as the last.
Any thoughts on this single-answer phenomenon? I'd be interested in thoughts on the answer-to-question ratio, too. The rest of the stats I kinda understand - you need questions to answer; you need those questions to be answered; you need users to question and answer and; you want to bring in new traffic which converts to new questions and answers. But I'm not 100% on the reason for encouraging multiple answers.