Good post @Giraffey1
I am baffled at the level of negativity on this thread, aimed at people who send cards. Some pretty nasty comments actually, ranging from people are 'ruining the environment' (like THEY never commit an 'against the environment' crime.) To accusing people who send a card to someone, of not actually giving a shit about that person. (Apparently, if you send a card to someone, you never actually speak to them, or visit them, or see them in real life, because you don't care about them, and actually probably hate them.)
What a load of shit some people do talk. 
And it is NOT a waste of paper and money. Not if it makes the sender and recipient both happy. You could say ANYthing is a waste of money if you want! Coz most things cost money, energy, materials, time, blah blah blah.
For fuck's sake, just leave people alone to do what they want, without mocking and bashing and berating! Just coz YOU don't like sending and receiving cards, so much so that you bin the bloody things before even opening them (though I don't believe this myself!) that doesn't mean OTHERS should not be allowed to send and receive cards if it makes them happy.