I have approximately 215 books on my kindle. Roughly 130 of those are books I have read. If I dislike a book, I delete it from the kindle. I may have deleted 1 book from my account -- not sure, but there was one that was a murder mystery and within 10 pages a dog was brutally murdered. I stopped right there and hit the delete button. I can't even bring myself to go back to the cloud and figure out if it is there.
I also have lots of samples. I no longer remember what attracted me to them. I keep finding too many books to read and I never get to the samples. Right now, I am reading HarryT's excellent Les MisÚrables. Fantastic! However I may not be able to get to another book this year because it is very slow going.