There can be humor present even in self-promotion ...
Phineas Taylor "P.T." Barnum (July 4, 1810 – April 7, 1891) was an American showman and businessman remembered for promoting celebrated hoaxes and for founding the Barnum & Bailey Circus. Although Barnum was also an author, publisher, philanthropist, and for some time a politician, he said of himself, "I am a showman by profession...and all the gilding shall make nothing else of me", and his personal aim was "to put money in his own coffers".
Never give a sucker an even break.
WI: What does #Trump really message? == P.T. Barnum == W.C. Fields> "Never give a sucker an even break" #GreenBay