Greenbriar Picture Shows has an entry about theatrical cartoons of the 1960's, including budget and income figures. If you don't understand why short cartoons disappeared from theaters, this will explain it.
I've worked as an animator, writer, producer and director in TV animation for 29 years. I created the cgi series Monster By Mistake.
I hold a Masters degree from York University in Cinema and Media Studies and am currently teaching animation at Sheridan College.
I can be contacted at mark(dot)mayerson(at)sheridancollege(dot)ca.