bad news and good news

An artist asked the gallery owner if there had bean any interest
in his paintings currently on display ."I've got a good news and bed news ," the gallery owner replied ."the good news is that a gentleman inquired about you work and wondered if it would appreciate in value after you death.When i told him it would ,he bought all fifteen of your paintings."
"That's wonderful!"the artist exclaimed ,"what is the bed news ?"
With concern,the gallery owner replied ,"The guy was you doctor."