I agree that the photography studio advertising its own business interests on CDVs or cabinets, is advertising a "product." I also believe that postcards are also selling a product - a postage medium. To me, its more important that the "cards" were made available to the public, and therefore collected. As someone said above, very early (prior to 1886), CDVs and cabinets were all they had. And postcards have been collected for over a century. Plus, both are simply COOL AS HELL!! (Which is why I collect in the first place).
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