The case seems to be good quality, I saw no complaints. And finding a good quality case for any phone for under 30€ is rare, and knowing the FP3 case is Fairtrade, 40€ is not particularly expensive. Over 50€ would be, but I find 40€ already quite reasonable. And if you complain about the price of he case, are you also complaining about the price of the phone?
Well… I don’t think so. Fairphone wants to start a movement, a momentum for Fairtrade an conflict-free materials. As someone said, Fairphone should become a label, not a brand. I don’t think becoming mainstream is the absolute goal of Fairphone. They certainly want to be known, but as @BertG said in another way, if this is to the detriment of their ethics, what’s the point? They already have a very low margin, and I agree with @BertG again, outsourcing won’t give a miraculous margin.
And then:
Same goes for the case…
(Btw., this debate has already been discussed, do we need it again?)