I think that kevin gave a good answer and pointed the demonstration given by Evan few months ago.
Of course some suppliers, manufacturers of uniforms, of weapons, Marshals and other Barons benefitted of the war and became rich.
But what did they represent ? A few hundreds, let us admit a thousand. Nothing if we compare with the million of privates soldiers, farmerís families, victims of the war.
The true economic richness, as said Kevin, was in the movement of the goods, the harvests and the opening of new markets.
To return to your initial argumentation, Napoleon did not wish the war in 1814. Moreover the files show well all the diplomatic attempts of agreement he tried to do with the powers. However the coalition had one only desire: to destroy Napoleon, and the Bourbons: to return to France.
The declaration of the coalition after the return of Napoleon, supported by the polpulation, shows very well their intentions :
"The wish of the French people, if it was fully noted would be nonetheless null and without effect."
It is necessary to tell more ?