Earlier quoted context omitted.
Depends slightly where you are, but often the ebook licenses are time limited, often to 1 year. So not only can't you resell the licenses, you have to keep rebuying them.
Public libraries really should stay away from e-anything, in my opinion. No library would purchase anything of the sort under my watch. Obviously, since patrons check it out, there is demand for it. Well, so what? There is demand for cocaine and porn; should public libraries offer that? Demand for something doesn't ipso facto oblige a library to provide it.
Of course demand for something doesn't make it something that should be free.
On the other hand, your arguments against e-libraries are just as vague and lacking in implication.
Libraries promote literacy and/or learning with every book read. Even as a source of entertainment, it promotes a richer culture. All of which does have a total health of society benefit.