Google's Pete Way.
I've never understood why an instrument is suddenly worth ten to twenty times it's actual value because it was once owned by someone famous.
I mean, yeah if it's something truly iconic used by an equally iconic star, then it would have some collectability value for museums etc, but some of the prices for a shortly used instrument are insane.
I suppose anyone can ask what they want for anything. Whether someone is willing to pay it is another matter entirely.