How often do you go shopping offline and judge the product by its package?
I prefer to shop online, and according to the rise of e-commerce, many of us do, too. E-commerce sites spend a fortune crafting bright and almost too informative product description pages. YouTube is full of product reviews. Many stores provide same-day shipping.
Every time I come home with a package from an online retailer, I unbox it to see a bulky, flashy, and perhaps an expensive retail packaging. I run my eyes over it to learn the same things I had already read on the product page when ordering it. All the resources, materials and energy needed to assemble that packaging will end up in trash minutes after.
I would rather save the environment (and a couple dollars) and get my stuff in an ugly recycled cardboard box.