My friend, Discount Coupons can NEVER be treated as INCOME..Because for Income there has to be some INFLOW..I know there are exceptions to this general rule but again exceptions has to be specified by law, its NOT something which is IMPLIED..
AS FAR AS DEFINATION OF WINNING FROM LOTTERY,ETC IS CONCERNED THE RULE OF INTERPRETATION SAYS THAT "WHEN GENERAL WORDS FOLLOW SPECIFIC WORDS, THEN GENERAL WORDS SHALL DERIVE THEIR MEANING FROM SPECIFIC WORDS" - EJUSDEM GENERES
Therefore Discont Coupons CANNOT BE COVERED UNDER THE DEFINATION OF WINNING FROM LOTTERIES,ETC