Comment by Imnimo

I could imagine cases where prediction markets could offer some actual insight, but in practice they seem few and far between. Most markets I've seen devolve into one or more of: betting on unimportant events (e.g. sports games), insider trading, or poorly written ambiguous resolution criteria. It's just hard for me to imagine that, on net, these markets will offer more societal good than the harm we've seen from sports betting.