Richard Feels Gratified

In the second-to-last sentence of chapter four, Wright writes that "Her inability to grasp what I had done or was trying to do somehow gratified me." This explicitly answers the question; he is gratified (and perceivebly amused) by the fact that his imaginative and creative writing was able to baffle the intellectual ability of those much older than him. He likes the fact that he is able to create a work of art that intrigues people; it shows him that he is very intelligent for his age.