You don't, but then, I assume you're not a stamp collector. Look, I'm not going to quibble about the bright lines that separate a "hobby" from an "art" or a "skill" or a "craft" or whatever you like, and I'm not going to argue about what belongs in what category. The "what" that you're comparing to aikido doesn't matter, stamp collecting or anything else. But whatever category you choose to put aikido in, do you truly believe that nothing, no other human pursuit, has "the same merit"?
Don't you think the same could be said about teachers and founders of schools of painting or music?
I didn't say Aikido is unparalleled or is more meritorious than other arts or pursuits; but the merit of Aikido is the subject of this thread. Yes the same could be said about a great deal of people. I was not putting O'Sensei on a peddlestool either, just trying to make a point about Aikido being important to O'Sensei and through Aikido, O'Sensei being important to Aikidoka. Nothing more.