Sometimes people do not want to see magic.  Only 
perform when you are asked to, preferably more than 
once.  Remember that line from a Somerset Maugham 
short story:  "'Do you like card tricks?,' he asked.  'No,' I 
replied.  He did five."  Even if your audience is anxious to 
see you do magic, don't wear out your welcome.  
Remember the first rule of Vaudeville "Always leave 
them wanting more." In magic, as in all the arts, "Less is 
more."