Some of the options on the list come with pillows and even a removable blanket. These extras can make a difference in your purchasing decision, but only if you consider those extras worthwhile. Buyers that have their own specific blankets and pillows they want to use will find the extras just get in the way, and therefore are an expense they can do without.
Only pay for extras that you eventually plan to use. As a side note, if you have other sleeping bag users in the house, you can give the pillows to them!