Artists sell self signed prints all the time. In limited editions e.g. 50 or 100 as they know that releasing more would reduce scarcity, prices would drop and

Artists sell self signed prints all the time. In limited editions e.g. 50 or 100 as they know that releasing more would reduce scarcity, prices would drop and no-one would buy their art any more. And the prints are difficult enough to duplicate without having some artistic skill. Infinitely more so then choosing Duplicate on a computer.