yes, this is a violation of copyright and could get him sued. There is no difference between making one copy and selling it and printing 20,000 and selling them. The estate could sue and could win a LOT of damages. Damages in the US are not limited to amounts that a violator made from the violation. In fact, if he made 2 copies and gave them away, he could, in theory, be sued and lose hundreds of thousands of dollars in damages if he lost in court. With ebay being seen by so many people, I would not be surprised if he did not have problems with this one....
Bill