Hi there! Firstly, thank you for being a regular at my DA.
You are awesome!
Secondly, to answer your question, I think that DA does sell things, but only prints. So, someone could buy a print of the picture of my card, but not the card, haha. I have been intending, however, to create a blog/website from where I can sell the cards. Once that gets started, I will share the good news!!