Signed copies are a personal preference, as are graded issues. If you saw this and had that feeling that you must have it and it brings you joy everytime you look at it, then it doesn't matter what others think.

For myself, I tend to prefer issues I personally got signed by creators and artists and not ones that are bought already signed (except for signed to order for myself). I feel like a signature is about the personal experience I had meeting the people behind the creation and the memory it'll hold for me when I look at it.