If adults want more kids to read why don't they convert some of the classics into comic books?

I mean it would make a lot of sense, one reason being it keeps your attention with the pictures. The pictures of a comic book can also help convey what's going on in the story better than writing especially in stories like Macbeth where they write in old English. Plus its actually less reading when u consider that half of a book is description. Why don't people make more books like that, and if they do why don't schools use them.