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Marc S.Prices at shows are always above what the "market" rate is for an autograph. Though certified autographs now offer a higher potential for security (e.g. less or zero forgeries....), the draw at shows has always been the experience of actually meeting your childhood hero.
I remember when DiMaggio's signing prices were up at the $150 range -- you could buy reputable signed 8x10s for $75 - $100, and this lasted for quite a while. Nonetheless, flat autograph tickets often sold out quite quickly.
Also, many of us, in addition to the experience, have "unique" things that we would like to get signed, sometimes. Whether it be a team ball, a special photo, etc., it all makes the standing in lines, etc. seemingly worth it.
The next time Mike Schmidt comes to town -- I've got a really cool picture of him when he played basketball before going to college. That I'll never be able to find in a pack... (also, I imagine Schmidt has never signed anything like that before -- so it might lead to a nice conversation!)