Yay for me that someone out there enjoys them and reads them. My first novel has them at the beginning of every chapter. My betas have all mentioned that they really enjoy how the quotes tie in with the story. They aren't famous quotes that everyone knows, though some of them may sound familiar.
My story can stand alone without them - absolutely. They aren't a crutch in anyway for me. I just thought it was a nice way to introduce each chapter. I really like them, and though I'd be slightly disappointed if an editor told me to delete them...I'd be so happy that I'd gotten that far, I'd delete them in a second if it'd get me published! lol No, I'm not a sellout. I wouldn't change my characters or my storyline - but as I said, my quotes aren't vital to the story.
so to answer your question, I don't mind them. I also like to read them in books because I like trying to figure out how the tie in with the story. But sometimes, authors use such obscure quotes, I can't quite figure it out, and then I forget to go back and read the quote after I've finished reading the book.
Wow, totally rambling! Sorry!