So, you have an audience of 50 - 100 folk wanting to get in touch with their dear departed to ask where they've hidden the money/jewels/incriminating evidence, etc, etc, etc. 2 questions arise from that scenario - well, many questions, really, but 2 will suffice for now; do those on 'the other side' form an orderly queue waiting to be brought forward. And why haven't any who have 'passed over' explained just what Heaven is like or if they've had the chance to meet God yet! Pure hokus pokus, imho.