I picked up a grading guide at Books-A-Million on Thursday.
The grading guide is going to give me a chance to properly measure the quality of my books. Now, the newer books are all 9.5s. The older ones are in some cases lower. The guide shows a good description of what each rating looks like. Many collection guides write out the criteria for each rating, but this book shows a picture. Being a new collector makes this book invaluable to me.
I recomend that you pick up this book and see what your books are worth.