As the body is selective of the type of fuel it uses given the conditions it is placed under for varying lengths of time and taking into account individual goals, "good" or "bad" fuel is largely subjective. Here is one example. Here is a brief article on how the body uses energy.
In a one hour period, if you ate 500g sugar, 100mL of olive oil and 250g whey isolate washed down with water, you would be at 3732 kcal. This is a very common daily macro split for someone on these calories, although the ingredients and meal timing for a healthier diet would vary.
It also seems reasonable that it is possible to consume this meal every 2 hours for a 12 hour period. This is 22,392 kcal in a 12 hour period. How much of this would be absorbed would come down to the individual. I think that in some cases the body would not be able to keep up with the digestive process and would exhibit type 2 diabetic type symptoms as well as amino acid deficiencies.
In order to try and burn as much of this energy from these 6 meals with exercise, the meal macro ratio would need to change from the previous example. We would need to keep the fat and protein close to where it is and up the carb amount. Obviously the kcal amount would be equal over the course of a day for the sake of the example. The type of exercise undertaken will also dictate macro needs to a lesser extent.
Burning 1866kcal/hr for 12 hours consecutively to come out at maintenance seems very unlikely unless you are a giant.
A "normal" person would most likely pass out from heart failure if the required exertion to burn 1866kcal/hr was maintained for more than a few minutes.
If you pushed your body hard enough to try and compensate for eating a massive amount of calories every day you would risk death from this after a short amount of time.
I can see your logic but there are other factors that need to be taken into account many of which I have not covered here.
TL;DR The human body has physical limitations in regard to burning calories and maintaining weight.