I must admit that I'm a fanatical convert to young adult books. I'd always read them here and there, but at this point I rarely even go into the adult fiction section at a library or bookstore. And even my e-book purchases are about 85% YA, and 15% other (nonfiction and adult fiction).
I do love that YA is full of firsts, and this jaded middle-aged woman can experience them all over again. But I think what keeps me going back to YA the most is the pacing. I've always had a low tolerance for literary fiction because I always felt like I was waiting for something to happen.
YA authors definitely do not have that luxury--if it doesn't hook a teen, they put it down. And interestingly, as a teen I was pretty stubborn about always finishing books. I might start skimming, but I would always want to see how it ends.
It's only as an adult, with more demands on my time plus a greater understanding of what I look for in a book, that I will now set books aside without finishing them. And reading YA has helped me with pacing my own books as well, even if they're not intended for a YA audience.
What about you? What makes you keep coming back to YA?