A good reason to allow it is because people want to do it and it is as relatively harmful as many other normative human behaviors.. A better reason is that it p

A good reason to allow it is because people want to do it and it is as relatively harmful as many other normative human behaviors.. A better reason is that it provides a means of measure real attitudes and opinions. The revealed prices afforded by prediction markets is interesting at the least, and possibly the best source of information for many of topics.