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davidcyclebackFor Gil, Leroy Neiman's limited edition seriagraph's screen prints of famous athletes, from Roger Clemens to Ali, are expensive on their own-- but are more valuable if signed by the athlete. In part, it expands the potential buyer audience as it is not an athlete autographed item.
Even Andy Warhol's prints of celebrities and athletes, which can can be extremely expensive on their own, are probably more valuable if signed by the celebrity. Warhol had nothing against autographs, as he had Wayne Gretzky autograph a number of his prints of Gretzky.
For the better living celebrity photographs in my collection, I likely would not want the celebrity to autograph the front. Though, I don't have a problem with celebrities stopping by my home asking to autograph my photos. If I start having this problem, I have baseballs for them to sign.