Miracle - or Meeracle?

What is a miracle? That was the question posed at a recent gathering, and it set me thinking. As a child, I first encountered miracles in the Bible, water into wine, the feeding of the five thousand and other amazing feats of Christ. In modern day-to-day life, however, the word has become devalued. Nearly every week newspapers talk of a miraculous escape or a miracle birth when all they mean is that someone has been more fortunate than usual. And when people talk about themselves they are more inclined than before to talk of a life-changing development, or even just an unusually good event as a miracle - a new job, meeting someone who turned out to be a life partner. And we all want to join in the party: anyone in a group who has not been the subject of a miracle is likely to feel left out or somehow lacking. We all want our share.
Yet for someone to win a new job or meet a wonderful romantic partner, they have to breathe, to exist, have the gift of life and the health to express joy. Surely that is the miracle - but as it is a miracle we all experience, maybe everything is a miracle and at the same time nothing is a miracle. We are; after that, nothing counts. That, though, is not good enough: we too must be showered with glitter.
But miracles have no objective existence. They are a status we confer on particular events, having deemed them worthy of that description. Atheists, I suggest, do not proclaim miracles: they do not stand up to the test of reason. However they exist only within a belief system, normally a religion. Believers thank God for a miracle, and as such they are an important part of the deity-disciple relationship. Indeed, they are the means by which a disciple affirms the existence of God. Only God can grant a miracle; I have just experienced a miracle; therefore God exists.
The trouble is that this argument is circular, for it is the believer who calls an event a miracle, and the believer has a vested interest in the existence of his or her God. There can be no independent adjudicator.
So are miracles merely meeracles, identified for the benefit of me, to confirm that I am worthy of receiving a miracle and to confirm the existence of the God in whom I otherwise merely believe? Or do they have some higher purpose?