Or because they differentiate you from others. English is full of that; there's "cow" for the commoners (from Germanic) vs "beef" for the rich (from French). Or

Or because they differentiate you from others. English is full of that; there's "cow" for the commoners (from Germanic) vs "beef" for the rich (from French). Or thee/thous for commoners vs you (from French 'vous') for the rich. I suppose the new purpose in those cases were to differentiate from the lower classes.