I was at the local library yesterday and I finally fully understood the power of Dr. Seuss. I was playing with my infant son and he was picking up books and putting them in a box.
When he saw a Dr. Seuss biok he picked it up and placed it bedide another Dr. Seuss book. That shows the brand power of those books. The way the book looks is very distinct. Another factor is that the books are known by parents and are therefore more likely to be bought and read.
Familiarity is a key to learning, and these books are a great link between generations that can be shared by people of all ages.