Grown-ups Turning To Teen Books in The Philadelphia Inquirer gives a number of reasons why adults are now reading YA fiction.
One book store manager is quoted as saying, "It used to be content. Sex, incest, drugs, abuse, all used to be adult themes only - but that's no longer true."
The article doesn't say that that's one of the reasons grown-ups are reading YA, but I'm sure it doesn't hurt.
Another favorite quote: "One of the reasons the YA age group is hard to tack down is that there is no industry standard that forces publishers to define the genre uniformly."
That makes me crazy! I must have a standard! I must have uniformity!
I found this article through ArtsJournal.com