What Is This Elton John Autograph Worth?

I recently got my ticket autographed at an Elton John concert. There were some special conditions which could possibly increase the value. It is a ticket to Elton John's very first show at the new Console Energy Center in Pittsburgh, Pa, also the show was played on the same day as Elizabeth Taylor's death. Elton John talked about her death and sang a song for her. It is a pretty legible autograph and the ticket is in perfect condition. The ticket is also front row, dead center in front of his piano. Thanks.