Why diesel trucks?

OK... I will bite into this one. I know my 5.9 inside and out...why? Because it was rebuilt at 53k miles for a very unfortunate failure. That is another thread but I do know it from the inside out... and that the fact is WHY is diesel fuel is more expensive(please explain why?)... but the mechanics and maintenance is what is really just the start. OK, .. with a diesel you have no plugs, no plug wires, or coils for each cylinder and no electronic injectors. On some types it is overkill with senors ...stick with a Cummins. It is a long term engine for at least 300k. Huge torque numbers that a gasser has trouble to come close to achieve or someone give me the numbers and show us all the facts.I have always been led to believe diesel is where the power is, otherwise why does it cost so much more? Trucks of the diesel caliber are dependent on the gear ratios but offer a more stable footprint with duals and offer bigger spring packs and usually bigger brakes...newer ones even offer exhaust braking... and much more. Mine is just at 99k miles and is an 02...It will be my last...pretty sure. Look at my profile...it explains everything.