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Scott...in most cases? I realize that some are truly poor mistakes that result from auction houses attempting to authenticate items that they really don't have the proper expertise to be involved with, but most can never be proven one way or the other. As David has mentioned, most autograph LOA's usually have "...in our opinion..." somewhere in the letter.
The real concern is with bidders blindly trusting "experts" - this might give the experts the feeling that they can give their stamp of approval without necessarily doing their homework as thoroughly as they did when they were still earning their stripes.