> If simpler packaging lowers costs and sales stay the same

In reality packaging is a very big part of marketing. People are drawn by vivid and bright colors, which is especially relevant in the modern world where unfortunately so many of us are living in a permanent hyper-stimulated state. It's hard to ignore well-designed packaging with tastefully chosen colors even if you're someone who is mindful about their eating/consumption choices and you know that what's inside that packaging is totally different from what you see from the outside.