Theists, why is it that EVERY claim of a "miracle" is nothing of the sort?

I've heard many people claim that "such and such" event was a "miracle" but not one of these events have EVER stood up to even casual scrutiny, let alone Scientific inquiry. Every one of them has either been outright fraud (Padre Pio, the "incorruptibles" the nonsense at medjugorje among others) or simply misunderstood natural phenomenon ("bleeding statues" and other such tripe). Every single one of them, when examined, is shown to be nothing miraculous. Why is that do you think?