Ask any artist, why they are in the industry and the answer surely isn't "making huge loads of money". They want to create beautiful and compelling content and vfx is no different on that matter. At its best, it is an artform that can take any visual experience to the next level, or in the wrong hands, it can be a nasty dent in otherwice beautifuly made product. There is always a fight between a production budget and the artists who want to create the very best they can. To balance that out, post production should be involved in the early stages of project planning to really hit the buck where it counts.