What i never realized was that a LOT of these books, Eric Carles are in that camp, are using words chosen to teach kids basic language skills and sentence formation. The ones that dont really employ a lot of those learning mechanisms, seem to be the ones that we grow tired of quickly and hit the back of the stack.. Im sure Nostalgia is part of it too.
Dr. Suess is similar and very heavy on sounds/aliteration. But you would be surprised to know that many of his books actually use very few words. Like Green Eggs and Ham is like 50 pages of sentence after sentence but only uses like 50 words total or something like that (i could be wrong, its one of the most famous ones that like that).
Honestly when I read to my young kids, i would get tired of the same books over and over and would just kinda make up the story. Now that my kids are learning to actually read, I dont do that anymore.