I think this is just something that some collectors do. I have a customer who only collects 2 different issues of Babe Ruth cards. (They're relatively rare, but not particularly expensive like some Ruth cards.) Whenever he seems them for sale at a reasonable price, he buys them. When I asked him why only these two cards, he said that he really likes the images on the cards, and it makes it easier for him to focus on what to buy. That is, rather than searching and looking at hundreds of different types of Ruth cards, he just has a couple of search criteria on ebay that he uses, which he checks every now and then. This is practically all he collects.
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