Ma Rainey's Black Bottom Signed Poster

by Sammy
(New York)

I went to a Broadway play in 2003 and have a poster signed by Whoopi Goldberg, Charles S. Dutton, Thomas Jefferson Byrd, Stephen McKinley Henderson, Carl Gordon and the rest of the cast in the play.
What would something like this be worth someone has offered me 500, but I think it might be worth a lot more in a few years.