Should I count breakfast as well, but only for one and not the other?
Ok. How about it's cheaper to make 50 16x20 b&w enlargements than it is to get them made. How about it's more reliable to make a b&w enlargement to try to use a printer to do it.
It doesn't matter, anyway. Logic is not what drives people to do anything. Perceived value is much more motivating. As for arguing about practicality, what is the use of arguing about the practicality of something that is, in most instances, superfluous? Are your photos "practical"? Do they serve a "purpose"? Does it matter if they are objectively "good"? Does anyone's life depend on them? In other words, do what you want without any concern for practicality.