Well clearly Apple doesnt have a fixed margin on all stuff they make, rather they do continuous detailed analysis of each segment of the market, competition etc

Well clearly Apple doesnt have a fixed margin on all stuff they make, rather they do continuous detailed analysis of each segment of the market, competition etc. and push given price as much as possible to have largest income. Accessories are logically overpriced even more since they already have you in their ecosystem, ie you dont buy samsung watch if you have iphone (but you still probably should buy top garmin instead, at least now). All this (and much more) is kind of expected from most worthy company ever. Competition does the same to some extent, Apple just has a bit more protected position so it can go further.