>It happened for other movies like "The lord of the ring",

The Bakshi film didn't fail at the box office: its budget figures range from $6 million to $12 (the latter is, I believe, hyperbole on the part of the director: the movie doesn't look anywhere near a $12 million movie) and it made $30.5 milion in the US alone. There were facts eating away at the profit margins for the studio, but on the whole it seems it made a decent (if a little underwhelming) profit.