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@Tradesecret
By the definition you pushed, my 14 year old son doing his homework before attempting to play Xbox would be a miracle. Its a very low bar, and clearly not what most people mean when they *seriously* claim miracles. It is quite clear miracle are thought to be the work of the claimants preferred god-concept more often than not. My definition is accurate.
Re fraud - it is a significant argument against miracles when known fraudulent accounts are still counted among the body of evidence for miracles by believers [link]. That fraud exists amongst those claiming 'miracle' isn't the problem - its that people choose to believe what has been admitted as fraud because there is no critical evaluation whatsoever (unlike science).
If people were claiming ignorance (the unexplained) was a demonstration of florb - skeptics would not be out of place saying there had been no demonstration thus calling into question the existence of florb. Florb believers might cry about skeptics pointing that out, but until claimants can establish and share knowledge of florbs (or miracles) skeptics aren't wrong.
Tl;dr? It is appropriate for skeptics to disbelieve miracles exists while the evidence/argumentation for them is literally ignorance.