Only time can tell really... that's what concerns me when people say that a psychic is "accurate" but haven't waited for the predictions to pan out. And trust me I have spent so much on "psychics" I could buy a house if I could get all the money back over the past few years.
That is why I have a love/hate relationship with Purple Ocean/Purple Garden. They allow maybe one or two weeks for you to post a review, and most of us get things predicted within months. The accuracy thing is probably the closest thing they will allow to capture a better idea of who resonates more with readers, but even then you need at least 3 qualifying reads to rate them on that.