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Marc S.I saw that PSA recently added a 1980s Topps "Super Set", which presumably includes all the Topps cards that were produced in the 1980s. That alone is worthy of nearly ten thousand submissions. You get thirty-three Crandell types trying to complete it in PSA 8 or better, thrown in a Spence or Ireland, and you have a business model that should be sustainable for at least a decade or two.
(as if there was any doubt...but PSA's Registry did recently add such a Super-Set)