I don't tend to look at it that way. Rather than, "Where is my extra two bucks or whatever the charger cost to make", it's still a simple math:
I get [this and this and this] for my $699/$999/$1099/$399/$599/whatever...is it worth it? So you add the cost of a charger and cable if you need one. I don't need one, I already have one. Not specific to the replied-to post, but I don't understand all the complaints that "I don't have USB-C." If you have an iPhone currently, the same things that charge it can charge the new one, I understand. One would pay separately (but only optionally) to upgrade the experience.
I'm happy to make that trade-off for the environmental advancement.