i've stopped sending cards, not because i can't afford to but that i've come to believe that it's a waste of a number of things ... my time, my money, paper, ink, glue, etc. the money now goes to charity instead.
i now only send to the 'oldies' in the family, and one friend who was absolutely horrified that she wouldn't receive a card from us so i've sent her the naffest one i could find.