Frankly, it sounds to me like he should consider himself lucky that, despite grossly mis-estimating the actual cost of printing and delivering his posters, he actually received enough funding to meet his obligations to his backers. If he had only raised the amount set as his goal, we'd be reading about yet another guy who's project was never delivered.
Maybe I'm being too uncharitable here, but I think his article is really a case study for why people should be wary of funding low-cost kickstarter projects that require delivery of physical goods.