Great question. I'm sure it is that they are mainly a food market, which is dirty, and they don't wish to get the cards dirty. Would be great if they could use more eco-friendly packaging. Thanks for pointing this out!
I paint cards just buy them from me, no plastic.
I personally like having them with plastic, that way I make sure to get the right envelope for the card.
You'll be happy to hear they plan to change this practice. https://tinyurl.com/y32msyh8
Thanks! Your answer is awaiting moderation.