The utility of any tool depends on the purpose of the user.
Objectively rare cards do not transact enough for comps on them to be meaningful. I recently offered a card for sale that had not sold anywhere in any format in several years.
Mainstream postwar cards are common enough that comps are a reference point but eye appeal is more important. A fugly 7 is not worth as much as a blazing 6.
Modern cards are so commoditized that comps are ubiquitous because there are a ton of them and they all basically look the same.
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