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David VarghaLike PSA, SGC and BGS are all a good thing in the land of the unscrupulous. Grading does not "create" value; rather it legitimizes it. Cards in EX condition or below often have no greater "value" in the marketplace, whether slabbed or unslabbed. Their NM/MT or better slabbed counterparts sell for far more than the unslabbed cards do.
The marketplaces establishes value. Legitimate grading helps to objectify (to a great degree) what it is that is being evaluated.