Right, I agree with you. From the tone of the post, it seemed like the author was justifying the GDP calculation as it's made. Perhaps there was some sarcasm there I didn't detect. But yeah, if we want to count the cost of services produced for, say, digging a giant hole and then subsequently filling in said hole, we may want to rethink our logic. I'm becoming disillusioned with the idea of economics being a valid human science when it can't seem to deal properly with the concept of externalities.