AA made most of his money as a commercial photographer until late in life, despite his growing fame. Getting rich selling prints just didn't happen much back then. He wasn't gaming anything in terms of potential increases in the value of his work. Others were, namely those who bought low and held his original prints until they were worth a lot, mainly after his death. He was wise enough to make provision for his heirs. And when they're sold in quantities of millions, even postcards add up to real corporate income.
I grew up near Yosemite, but my parents wouldn't allow me inside Best Studio, since it was mainly a lot of ceramic chipmunks and mountain-pictured mugs precariously set on shelf edges specifically so that little brats running around like me would bump into them, break them, and the parents would have to pay. Ansel was the son in law of the owner, having married Virginia Best, and sold his own images in there too, but not much in actual gallery form, buy more gift-shop-like, just like all the other stuff. My older brother would go in there and look at the prints, and I'd peek in from the outside.
Ironically, I never saw a real AA print in my entire life until I had my own gallery openings in Carmel, and all in color. A number of famous photographers lived there at the time, including AA; but I never met him personally. By then he was getting pretty old and feeble. I did split a major retrospective exhibition with his work timed right after his death, so overall, did eventually get to see many many prints of his in person up close. Quite interesting to me, since the high Sierra he so loved was pretty much my own backyard too.