I send cards, and do like to get them back, but I understand that times have changed and not everyone does it. So I don't take it personally if I don't get one back.
I live in a little village (300-ish people) where the demographic is two thirds over 55, and people do give and receive cards. Some people class it as a snub if they send a card, and don't get one back. It's not a case of 'I only give to receive;' for some, it's tantamount to smiling and saying hello to someone as you're passing, and them ignoring you.
Many people are from a generation that send cards (and like to receive one back.) And just because someone sends a card, that doesn't mean they don't also speak to people, or ring them. What an odd thing to say!
I give to family, neighbours, work colleagues, and friends. I also give them to the doctors, dentist, bank, local shop, and several other businesses. I hand most of them out in person (or post them through the door,) I only send half a dozen by post now.
I don't send them just to get them back, but it's nice when someone does send one. I do however, hate to receive them from people who never bother with me and my family the rest of the year, and send the dreaded 'round robin.' THEY get thrown straight in the bin, without being read!