Honestly, I wouldn’t be too happy if someone traded a card I sent to them.
Of course, I have no control over what happens to a card I’ve sent, but I try to trailor every card for the receiver, do my best to choose a card they might like and decorate it. After all that effort I would be sad to see a card given away.
Also, they often contain so much personal information about me depending on what the person asked to write on their profil. Sometimes (esp. on envelopes) I also include my address. I don’t want anyone to give that away.
But I also understand that sometimes you receive cards you simply don’t like or you can’t (or don’t want to) keep all of them for some reason. And throwing cards away would be a pity.
For me giving used cards away is only OK if :
- the messages don’t contain too much pesonal/sensitive information about the sender
- there is no address of the sender on the card
- the card is really old/vintage/antique (written a very long time ago), I have quiet a few used card I bought from the local flee market form the 1890s-1950s
As for what I would do with used card: I still keep and cherish them. They all still tell an interesting story, are full of pretty handwriting/decorations/etc, and have stunning pictures. I have them in a special separat album.