Yeah, I stopped reading them both, too, although my friends kept on. Reader expectations.
I didn't like where the author went, and that was the end of the series for me.
I used to belong to a Yahoo Group for The Hollows - and I seem to remember the book series was originally set for maybe a third of the length it ended up being....and the stories went downhill when the publisher pushed her to stretch it out. I don't know if that was true or just speculation...