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davidcyclebackA modern player's memorabilia value is almost at it's highest around the time he breaks that important record. The values almost always go down afterwards. The problem for Bonds is his peak value-wise actually was a few years ago. His autographs and game used material sell for less today than they did five or six years ago. His approach to the big record has been accompanied by a large decrease in memorabilia value, which is unusual.
The irony is that, if anyone's, it will be Aaron's memorabilia that will raise in value-- and I bet they will. Roger Maris' memorabilia values have risen dramatically since he lost his record, while McGwire and Sosa values have fallen. The cause of the increase is because today's collectors were reminded how great and nostalgic was his feat. It was like a re-release in theaters of a classic movie.
There's a bit of investment advice in there. If a record's going to be broken, don't forget about the guy who will lose the record.