People are often too poor to pay attention.  When I was in the Army, a chaplain friend of mine told me a story of how he checked to see if people were really paying attention.  In the Gospel Church tradition, when the preacher would say something and pause, the crowd would recite “amen” in unison.  One morning he got going and started with a string of statements, each of which were followed by “amen.”  Then his next statement was, “and I’m wearing purple socks.”  As you might guess, the response was “amen.”