Cancer is a disease with high costs where a lot can be gained. Watch a documentary about Dr Burzynski who has a cure for various types of cancer: https://www.youtube.com/watch?v=rBUGVkmmwbk The documentary shows how officials and the National Cancer Institute work against him and hence continue the high cost.
On websites like https://drhyman.com and https://www.chriskresser.com you can find doctors who explain a lot about root causes of diseases and how to cure oneself. If all would read these sites the costs for health would drop more than 50%.