Why do you think that the Young Adult genre is so popular with even the adult readers? Do you read YA books, yourself?
I think that YA is popular, even with adult readers because the writing is much better than it was when we were young adults and the genre is so varied. I think it started with the Harry Potter books that made the YA genre popular with adults and its just grown from there.
Yes, I do read YA and I quite enjoy them and enjoy them more than I did when I was in the target market.