Wow, how many guitars has Willie Nelson signed. He supports an entire ebay industry. I have seen them hovering around his bus at a show with their guitars. Of course, that means I am hovering, too, I guess, but not for autographs.
If he had a dime for every guitar he’s signed, well, he’d have a lot of dimes. There are about a million guitars on ebay, for a much as you want to spend on one.