Geoff, what you say is probably quite right, and to the person that wants an occasional print or be it many at one specific time, then it is probably the way to go.
However, as for myself I have 3 printers, which at times are all running at the same time producing the photos I want for special projects.
To date I have printed well over 5000 photos over the last 4 years, yea, scary and expensive, when one uses genuine Canon ink and paper.
Sometimes I want prints of smaller size on larger paper etc, so for me it is better to have the convenience of choice, and printers.
My dear wife is constantly telling me when I look at other printers, surly you don't want another one
no not today dear
Leon