I'm having a hard time understanding how you are doing this math. I mean you would have to throw the phone in the trash every year to even come close to that number. I just upgraded from a 12 pro max to a 13 pro and it cost me $210 + $15 for a new case. I have not needed new accessories since Apple switched to the lightning cable.
Further, other commenters are suggesting getting a new phone every year is bad for the environment. Again, if you are throwing your old phone in the trash, sure, but that phone that Apple just gave me $790 for is not going in the trash. That phone is going to get a new battery (which was needed, and the old battery should be recycled because that is cheaper than digging up new lithium out of the ground) and then put into the hands of someone who needs a phone but doesn't want to pay for a brand new one.
If your iPhone 8 still serves you well, good on ya, but at least keep the math within the realm of reality.