I said on a previous thread where daft people were saying all you need from an ad is a 1;1 return that my advert brought in 5-1 but i worked out this number when the book just came out, during the busy xmas period it went barmy I would guess it brought in 7/8-1 so it is worth doing, that why I've done exactly the same ad in another book, I'm hoping for the same return.
Mike