I get that the post office is a federally run program, however for a long time they were required by law to fund themselves without tapping into tax dollars (with the income from stamps and packages) However, they are prohibited from making business type decisions like cutting service on Saturdays by congress. The reason the USPS is in such a bind now is that the government controls excised over them is prohibiting them from making changes like other countries have in modernizing their mail systems to compete with email. Plus the union, the unions kill their ability to innovate because they can't fire anyone without being sued. So we could look at AR as being on the stamp as her smiling "I told you so".

I often cite the Minkus article to explain numismatics to non-collectors. I also use it to show that independent of the actual objects of pursuit, hobbies centered on collecting share this same essential attribute:
"The pleasure lies in a certain special way of using one's mind. Stamp collecting is a hobby for busy, purposeful, ambitious people...because, in pattern, it has the essential elements of a career, but transposed to a clearly delimited, intensely private world." -- Ayn Rand.