It is true what they say. No reason to delete perfectly good photograph, unless it is really under or overexposed or not in focus. And to come back to old photographs later, you never know what you might see in the old image. Like this one. It was an unsuccessful try to capture the flame from the burner on the background of the balloon. You can still see the flame at the bottom. It is not, however, the focus of the image anymore. When I looked at this image today I saw a colorful abstract of the balloon interior and cropped accordingly.