They need budget to afford high quality studios, more experienced artists, softwares, hardwares, and maybe even licensing some assets they can’t get firsthand.
Also, the longer they work (i.e. the movie use more CGI), the more the people have to get paid, and good CGI really need to pay attention to details
so you either let the artists do longer work *or* get more people to work on the same scene–both results in more costs.
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