Good post there by jar.
I agree that repeatable miracles, or in Grizz's case, a certain statistical percentage of 'miracles' would rather negate the whole idea of a miracle.
I also do not believe you can have confirmed evidence from someone who is not a believer, or has no vested interest, because part of what a miracle is, is the answer to a prayer. Folks link the cause and effect. Those who don't believe in God still experience the unexpected or unexplainable, and refer to this as a 'miracle', because in this world, sudden, seemingly uncaused, inexplicable events DO happen.
Therefore, I find it funny when someone says they would believe in God if they saw a miracle. Or, when they say they would tentatively believe in miracles with proper proof. Chances are, they wouldn't, because they are neglecting the key word 'belief'. If they believed in miracles to begin with, they would find them abundant.