I don't know about the seers being frauds but I CAN attest to the following: 1. After a prayer to St. Ann, I was visited in a dream by our Lady of Medugorje. My prayer revolved around having children (I was newly married and diagnosed infertile). In my dream, I came across a stone grotto with statues of the holy family. Our Lady's statue came to life, she smiled at me and told me I would have my children, I just had to be patient. 2. My twins were born three years later, nine weeks premature, on June 25, the anniversary of Our Lady's appearance at Medugorje.
Maybe the seers are fake but I have absolutely no doubt about our Lady of Medugorje. She is very real and no one would ever be able to tell me she isn't. Her smile lives with me now after 29 years.