Why are miracles fake?

Answer 1

Miracles, by definition, are not fake, but "a sensibly perceptible effect, surpassing at least the powers of visible nature, produced by God to witness to some truth or testify to someone's sanctity." (from Modern Catholic Dictionary) So if something is a genuine miracle, it is not fake. However, people throughout the ages, for one reason or another have tried to "fake" things to make them look like a miracle. These are frauds, not miracles, or there are things which are beyond our power to understand which are produced by the Evil One. A good example of the later would be the "miracles" produced by Rasputin.

Answer 2

Not all miracles are fake, in the sense of being intentional frauds. Sometimes, well-meaning people genuinely believe that when they recover from an illness or it goes into remission, this was a miracle brought about by a saint to whom they had been praying. Those miracles that are truly fraudulent are usually reported or elaborated in order to bring people to the faith.