The 70-90% bracket for me is ~70 predictions judged; I don't think most or even many of them are economic-related (except in a weak sense).

If you wanted to check my intuition, there doesn't seem to be any easy way to filter my user page for just the judged ones within a probability range short of downloading and processing the HTML, but you could look through a few dozen or score of the recently judged predictions (http://predictionbook.com/predictions/judged) since I have looked at every prediction on the site and registered my own probabilities for essentially every prediction which isn't either sports or highly personal (and even then I've frequently given it a shot anyway).