Your almost there. Just one more connection for you to make.

Yes anyone can put a grade on anything. But if he didn't put it in a slab do you think people would buy them? Even if he graded them, no they wouldn't, but the slab causes people to relinquish personal responsibility and they simply rely on the grading company.

And if he didn't slab them and grade them would he really be doing anything wrong? No. He is selling pictures he cut out of books there is nothing wrong with that, its the slab and grade that causes people to assume that it is a card.