The cost of astronauts signatures are a real problem. I have a dedicated John Young's signature that cost me $450+ but!
A few years ago I spent £700 to buy an undedicated WSS Neil Armstrong , I thought I was mad but I sold it this year for nearly £4000 to a reputable dealer in the US after he saw a high res scan.
I don't give a damn if it was worth $1 or $1000, I just want a WSS Armstrong that says "To me!" signed by the man.
The chances are slim but I guess that is the difference between a collector for the right reasons and a speculator.
Later
Neil