Why does Artemidorus fail to get Caesar to read his warning?

In William Shakespeare's play "Julius Caesar," Artemidorus fails to get Julius Caesar to read his warning because he appeals to Caesar in the wrong way. Telling Caesar that the note is of personal importance to Caesar, Artemidorus consigns his note to the bottom of Caesar's correspondence.

Seeing Caesar on the street on that fateful Ides of March, Artemidorus hails Caesar, saying, "O Caesar, read mine first; for mine's a suit / That touches Caesar nearer: read it, great Caesar." Caesar replies dismissively, "What touches us ourself shall be last served." By failing to read Artemidorus's warning, Caesar dooms himself to assassination by Cassius, Brutus and the other conspirators.