My guess is that it has to do with the discount Amazon offers for Subscribe & Save and the fact that diaper and coffee needs are easy to predict. Those are two things that you don't want to run out of, so it's worth buying in bulk.
Wow, that's kind of awesome. I looked at the first 2 pages and it's literally almost entirely diapers and coffee, sprinkled in between I noticed maple syrup, coconut oil, and wipes for all those diapers and at the end a box of Honey Bunches of Oats.
