Selling a 40 cent card for 40 cents costs the seller more than 40 cents, considering final value fees are assessed on shipping. And that's before I consider what I paid for the card. I'll throw a card away before I do that.
Ebay isn't the best place for super cheap cards, COMC is better, card shows/shops are the best. But then you have to drive there and hope the cards you want are available.
I won't buy from COMC, because they charge $4.99 shipping. I'm not going to pay that per card, when I know shipping one card really only costs one stamp, whatever is the current rate, usually $.60.