I always wonder this. A similar takeaway from the Indian will usually be 50 %50% more expensive.
TbhTo be honest, I think the fresh fruit and veg is dearer in Chinese food than the potatoes and spinachesspinach in Indian.
Indian Indian venues use very little variety in way of healthy vegvegetables.
As for saying the Indian meats take a longer time to cook you are looking unfairly. I believe tikka is done and put aside them mainly added to bought in sauces later.
Think about Chinese foods such as twice cooked pork. It is braised slowly as part of the dish.
The Chinese use a lot of spring onions, ginger, garlic and other ingredients that are so similar to Indian food.
TBHTo be honest, I think Indian restaurants just price up to a point where people would stop buying, and the Chinese charge reasonably.