I think it's generally the knowledge gained part and how that impacts your collecting. For example, if you know all of the different poses and variations for particular cards for the Old Judge set or you are familiar with very obscure sets that collectors don't know about. For example, an advanced collector might collect T206 backs down to the Factory Number while a regular collector of the set may not integrate that into their collecting. Or an advanced E98 collector would try to accumulate all of the colors while the normal collector would just go for one card for each player.
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