Professionalism comes from many things, but it is founded primarily on integrity.
Hey, have you ever heard phrase "professional manager"? Perhaps this is the reason why.
To kick-out the thread drift: pilots possesing CPL and ATPL are called professional pilots. Therefore true professional pilots do their utmost to prevent their certificates from being revoked by: a) local CAA b) the Grim Reaper. First sentence is from my Air Law, the second one is MHO.