What is the total average movie directed by the directors who's quality and revenue is 4?
SELECT CAST(SUM(CASE WHEN T1.d_quality = 4 AND T1.avg_revenue = 4 THEN 1 ELSE 0 END) AS REAL) / COUNT(T2.movieid) FROM directors AS T1 INNER JOIN movies2directors AS T2 ON T1.directorid = T2.directorid