Great question. Who cares? Their existence (or lack thereof) is of no importance.
We need to stand on our own and look for truth in the things that can be proven and not in the realm of useless speculation.
Perhaps if we lived be best lives that we could, loved wisdom for its own sake and treated others as a reflection of ourselves, we wouldn't need to be concerned with such useless matters.
When that day arrives we will regard such silliness as chasing after mahatmas, gurus, masters, etc. the way we react to the idea of eating rocks.