The population of slabbed cards is a combination of clean cards and (reasonably) well-doctored cards.
The population of unslabbed cards is a combination of clean cards and poorly doctored cards.
So it seems, as long as you're at least as good at detecting alterations as the graders are, as seems to apply to an increasingly large proportion of Net54 members, that it's safer to buy raw since the altered ones will be fairly obvious.
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