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Marc S.For another example of where grading has increased the "value" of cards -- look at the Kelloggs sets from 1973 through the 1980s.
The sets, as listed in factory form, came in sheets of three cards (sometimes more -- always three across, but the top and bottom sheets were not always attached).
At any rate, up until one or two years ago, Kelloggs cards were worth about $50- in complete factory set form. Today, with the advent of grading, GEM MINT 10 examples go for the hundreds of dollars.
There are some Kelloggs sets for which this does not apply, of course. 1970 is the most prominent example.