If there were no titles of interest on Overdrive then there wouldn't be waiting lists of 80-some people.
I've found our library staff more than receptive to suggestions on good books and authors to add. They also make a real effort to divide the purchases up every month between various genres and age groups ... a certain number of kid books, a certain number of Young Adult, some Romance, some Sci Fi, some non-Fiction ...
However, they're fighting publisher availability left and right. MacMillan says no, Harper Collins wants to limit it to 26 check-outs etc etc. It makes their job tough.