<p>Aside from the (very valid) concerns from @whuber, it's still a great idea if one could this right. For example, an assignment could be to ask <em>one</em> good question and to give <em>one</em> good answer on CV. This would do away with the incentive to spam the site. The instructor / TAs would have to evaluate the questions and answers on their own to do away with the incentive for students to upvote each other.</p>
