I can testify as to #'s 2 and 3. My beloved golden retriever, Toby [RIP 2009], was trained according to their manual. He also enjoyed those treats.
I take exception to the term "odd", however. These are fairly standard things one may buy. Perhaps the people at Mental Floss think that monks would only be normal if they sold Bibles, chant recordings, or portions of the "one true cross". Muggles are strange in their regard for people of faith.
By the way, when I was a monk, we kept bees and sold tasty honey.