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Judge DredEbay has a graded card section (within the Pre-1930 category) which is subdivided into PSA, GAI, SGC and other graders. I would be willing to bet that if you went to the PSA category and searched it for CRACKER JACKS (or what ever) you probably wouldn't find too many SGC, GAI or PRO graded cards. However, if you do the search on all Pre-1930 cards then you might come up with the different graders cards in the search because of keyword spamming. If appropriately placed in the PSA graded category then I would be willing to guess that people could find what they were looking for (in that category) with a minimal amount of those extra cards that shouldn't come up because of keyword spamming.
I suppose if you globally search the Pre-1930 category for PSA material you may become inundated with stuff you don't care to locate.