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MVSNYCi just dug up this old thread...
i have to say Peter, this is a good topic.
it is important to note, now that PSA & SGC slab trimmed (altered cards) as "authentic", it definitely gives added value, worth & life to such cards, which if raw, would be worth much less or almost next to nothing...i think the added value (whether it's a well earned value or falsley perceived is debateable) stems from a sense of confidence that PSA or SGC deem the card authentic/genuine...and on certain cards, that is all a collector really needs to see or hear...
i think specifically, you will see more of a noticable jump in value on rare variations, rare backs, etc. which are slabbed as such...because collectors will want and be satisfied with having a mere "authentic" example...(i.e. trimmed T206 Drum backs, Cracker Jack Jacksons, rare Old Judges, rare cabinet cards, etc...)