Producing for a small sector of the population is not profitable. It's almost impossible for a publisher to exist by producing only for children. Third, let's look at the problems of the readers. Children can't always find what they need to read. Television is easier to reach than libraries and bookshops.
Parents have no guide in finding good books for their children.
The education system doesn't promote reading other than schoolbooks. 1 Alpay, Meral. 1983 Nesin Foundation Yearbook.