What do you think about the movie 'Never Let Me Go"?

The acting was good and the writing wasn't bad. I found the story line a little hard to believe and I discovered I had more questions about the film after watching it than i did before. Every single clone was ok with dying? Really? Not one of them tried to escape? Common people can afford to have themselves cloned? There were only a few bleeding hearts that knew raising people for spare parts was wrong? Maybe if I read the novel I would understand more, but I doubt it.