[Sol-]

Shame that prediction markets seem to have failed a bit, since they seem in principle like a good idea. You force participants to have skin in the game and remove the usual mood affiliation and ideological bias that afflicts the professional commentariat in the media.

Perhaps a solution instead of banning them would be to create a class similar to accredited investors that are allowed to participate. And stuff like market manipulation should just be prosecuted in old fashioned ways like we prosecute any crime.