Making wars unprofitable doesn't prevent all wars. That approach is stupid.
However, making war less costly (for the victor) could well cause more wars. I believe that before WW I many a war of conquest was initiated by states hoping to profit. WW I was thought by many states as another great chance to profit, but it turned out that mechanization of logistics, and artillery, meant the toll of war was much lower.
Besides, the 'ospolitik' was more about building relationships and mutual respect than an attempt to affect the cost-revenue analysis of war.
However, making war less costly (for the victor) could well cause more wars. I believe that before WW I many a war of conquest was initiated by states hoping to profit. WW I was thought by many states as another great chance to profit, but it turned out that mechanization of logistics, and artillery, meant the toll of war was much lower.
Besides, the 'ospolitik' was more about building relationships and mutual respect than an attempt to affect the cost-revenue analysis of war.