In this case you may be right, but in general there are certainly cases where adding a layer makes it cheaper: if the layer you add has a lower cost structure than the one it interposes. Imagine a path from A to C ... if the cost of A->C is greater than some new (A->B + B->C) then it can make sense.
Certainly that works for at least _one_ level of distribution all the time: producer direct to consumer is almost never an efficient way to go. Sometimes you can get many levels involved and it still makes sense. Gasoline is probably a good example product where the addition of several distribution layers helps out quite a bit, since each step is fairly specialized.
/jordan