Begging, like every other money making activity, legal or not, has "tricks of the trade". A skilled beggar will actually put some coins in their cup etc when they start to beg -this is called "bait" -people see the few coins and feel more compelled to give than if the cup is empty -the psychology being they feel guilty if others have given and they have not. Large amounts left in a cup etc would have the opposite affect -the beggar has enough already, so I do not need to give. Buskers use the same trick.