Given Fairphone is a rather small company they sometimes have such problems of economy of scale - no manufacturer will prioritise you if you make small orders.

That said, one reason for the Fairphone price is the "fair to the people labouring for the parts of the phone" part. I'm unhappy with the camera quality, but honestly knowing that the premium I pay means fairer working conditions is for me an important element. I prefer to pay the small social enterprise establishing a new kind of supply chain and developing a modular phone, rather than the Samsung CEOs and stockholders.