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T206Collector...I will assume that your question was whether I would purchase cards graded higher than SGC 80 if I had a larger amount of disposable income than I currenty have. That is a hypothetical question that is hard to imagine answering. Last week I purchased an M116 Walter Johnson SGC 70, which is about as nice a condition card that I could ever imagine owning. I am not sure it would ever be worth it to me to pay thousands of dollars more to upgrade that card to an 80 or higher. For one thing -- and directed more to the point of my initial post -- cards graded higher than 70 or 80 are, in my opinion, more likely to have been altered than cards graded much lower.
If you are principally concerned with unaltered cards, then high grade cards should not by your focus. I recommend that anyone with a large stash of vintage cards graded 6 and higher by PSA to have them looked at by your friendly neighborhood SGC grader at the next big show. They'll take a look at them, for free, and let you know what they think of those cards.
I brought 40-50 PSA graded cards to a show to have SGC take just such a look, and the results were very educational. They pointed out wrinkles in a 6 or two that I had owned for years and never saw. They demonstrated how a 5 I had owned had been trimmed on two sides. In all, about 25% of the cards I showed to SGC, they could not crossover to the same or higher grade.