You are likely overestimating the production cost of foam cushions and light seals. We know there are 4 cushion sizes, I think it safe to assume 4-5 light seals at most.
Let's assume it costs Apple $10 PER light seal and cushion(it doesn't, nowhere near that with Apples scale and logistics). But let's just be stupid about it. That would be $40 of cushions and $40 of light seals. $80 of "included" accessories FOR A $3500 device.
A secondary advantage to including all options to the end user is the ability to share and show off the product with friends and family. Given that XR is almost impossible to properly advertise for, and the only way to assess it is to physically try it, the inclusion of all available cushions and light seals is a no brainer.
EDIT: Also there is zero chance you would "Guess" your light seal size, I was being facetious in agreeing with how stupid of a thing that is to say. They would obviously have an app that scans your face and chooses the likely correct light seal if they were to do that. Which by the way, is even dumber, because it would make shipping an absolute nightmare with having to pick/pull single pieces of foam cushions and creating a custom box when they can just add them all to one box and not have to deal with that nightmare.
Let's assume it costs Apple $10 PER light seal and cushion(it doesn't, nowhere near that with Apples scale and logistics). But let's just be stupid about it. That would be $40 of cushions and $40 of light seals. $80 of "included" accessories FOR A $3500 device.
A secondary advantage to including all options to the end user is the ability to share and show off the product with friends and family. Given that XR is almost impossible to properly advertise for, and the only way to assess it is to physically try it, the inclusion of all available cushions and light seals is a no brainer.
EDIT: Also there is zero chance you would "Guess" your light seal size, I was being facetious in agreeing with how stupid of a thing that is to say. They would obviously have an app that scans your face and chooses the likely correct light seal if they were to do that. Which by the way, is even dumber, because it would make shipping an absolute nightmare with having to pick/pull single pieces of foam cushions and creating a custom box when they can just add them all to one box and not have to deal with that nightmare.