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But here is a bit of evidence that might be an example of a war that was not primarily motivated by economics. Hatfields and McCoys
Hard to say if it was or wasn't given that the "bad blood" seemed to exist out of nothing - according to the anecdotal evidence provided in your link. My hypothesis is quite specific, to wit: ECONOMICS IS THE MAIN MOTIVATION FOR WARS AND INTERVENTIONS. In other words, even when there are other motives, the economic ones are the most important.
You never change things by fighting the existing reality. To change something, build a new model that makes the old model obsolete. R. Buckminster Fuller