'Treasure Planet' is a beautifully animated movie, which means that it costs a boat load. Cartoons are expensive, especially when they look nice. Think about all the artists you have to pay just to make one character. No wonder Disney used to just reuse animation for every one of their movies. They wouldn't have been able to do it otherwise. I blame this movie not doing well on the fact that there weren't cute enough characters. The funny sidekick was a robot, which can be cute, but not as cute as a monkey.
The movie cost a whopping one hundred and forty million dollars, and barely was able to scrape over thirty million dollars in the box office. The Rotten Tomato score is at sixty nine percent, and it does star Joseph Gordon Levitt, so it's definitely worth a watch.