You don't seem to have understood the post. Try reading it again.

My point is, we're both worse off if the seller gives me a full refund for a return than if the seller a 50% refund without requiring a return. That's because the postage on this item is greater than its original value.

For the sake of argument, let's say I was willing to return the good for the full $22.90 refund. My point is, that wouldn't be a good decision for either of us.

Yes, I am worse off for the reasons you quoted. But the real point of the post was that the seller will be worse off too.

Try reading my post again. Follow the maths. You'll see I'm right.