My assessment of rarity has more to do with how often I see things up for sale than an absolute number of items available. Since I have been collecting photos of Gehrig(around 7-8yrs now) I would estimate that one of the various examples of these photos comes up for sale around once or twice a year. Considering there are plenty of photos that come up far less frequently than that, I don't consider this photo rare, even though there might only be a handful of each pose.
Now that fact does not make it less desirable to own one, but if there were only one known it would probably sell for waaay more money. As a comparison, the only know type 1 of Cobb sliding into third, which is certainly equally iconic sold for $49K recently. If there was only one of these, it could be the same.
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