How about miracles like levitating in thine air or walking on water? Do they qualify as “miracles” even if they serve no purpose?
I realize this is a pretty expansive definition, and could open up a world of controversy.
Even more controversial is that some of that stuff can be achieved by evil supernatural entities, a.k.a. demons. I think all such things are very rare. I have never seen any of it first-hand.
There are some people, known to me personally as intelligent, educated, honest and sensible people, who have seen these things first hand. Both the divine and the demonic. They were not the sort of people who are gullible, naive, attention- or profit-seekers, or unacquainted with the normal rules of evidence. They could still, of course, be mistaken.
Personally, I hope to stay clear of it, since I'm as susceptible to deception or delusion as anybody. Quite frankly, I would be the first to doubt my own judgment in the matter.