I honestly don't get that whole thing either, or autographs. I do have a few books autographed by their authors, but even those don't really excite me. It was nice to have a chance to interact with the authors and let them know what their work meant to me.
But, like, when Jackie O's stuff went on sale and the prices were sky high because Jackie, I thought it was so weird. Some things, like a gown that really represented her style or that she was wearing on a certain date, or her pearls, I could see because they are so associated with her and historic, but just to have a letter opener she touched - who cares?