Answer:
I am a protector of the scoreboard.
I don't have eyes, but once I did see. Once I had thoughts, but now I'm white and empty. What am I?
What bone has a sense of humor?
The person who makes me doesn't need me. The person who buys me doesn't use me. The person who uses me doesn't know it. What am I?
I'm not really more than holes tied to more holes; I'm strong as good steel, though not as stiff as a pole.
No matter how little or how much you use me, you change me every month.