Everything in this world needs to be eye catching, so is the demand for your content marketing. Converting light into ideas, of visually understanding the concept solves the problem. Visual perception along with text hits brain much faster than a normal process.
Still if you need a better convincing note, I would simply convert this discussion into a beautiful visual form, compiling six points of best looking and most informative info graphics nailing the ideology of visual content marketing. Here goes the list, awaiting the snippet of your favorite.