I can't argue that.
In terms of cold brew, don't you need basically coffee filters, a strainer, and a large container?Also for convenience.... someone like me who doesn't own any coffee brewing products.
I can't argue the convenience (which goes for like 90% of beverage products) but for stuff I can easily produce at home (eg this, lemonade, iced tea, etc) I'd never buy pre made.
Stuff like "Orange Juice" I do because it's a pain squeezing a case of oranges. It's a terrible product compared to fresh squeezed but will fix a craving sometimes.
Lemonade I leave out because it's not any work to even make to order. Squeeze a lemon, add simple syrup, add water, stir.