With math like that I am not surprised this approach appeals to you
Let me be more clear, since you seem to be having trouble with the concept here.
Garbage which would otherwise end up in a landfill goes in one end. More energy is produced in a useable form (oil and gas) than is consumed in the process. That is a good thing.
Is that simple enough for you, or would you like more help?
I think it is you who need to look up the Second Law of Thermodynamics.