If you purchase a poor quality product, you are the one to blame: this is already the case now if one chooses to buy a cheaper product from a less reliable source. Under a 3D printer market you are still likely to be purchasing most of your products from reliable brands with an incentive to keep producing quality products as they want you to return and buy more of their products. If you choose not to, you are aware of the risk you take, and can easily inform yourself of the risks on peer review websites and forums before making your choice.