I can go buy two sticks of 6400MHz DDR5 for $20 per 8GB, to match the bus width and speed. The manufacturer might be paying more than $10 for the chips, but not much more. I don't know if I should expect much price difference between DDR5 and LPDDR5?
We were talking about $10 for Apple to buy raw RAM chips.
I showed that a company can buy those chips, put them on boards, package them, ship them in tiny quantities, market them, and support them for a total cost of $20.
How much do you think those things cost? They all need to be subtracted from the $20, and also Apple can probably get a better wholesale deal than the brand I was looking at.
I'm not saying $10 is definitely right, but I think it's a pretty good guess.
I'm not sure what they cost to Apple (can they use standard parts?), but I'm also pretty sure other laptops don't have up to 400 GBps memory bandwidth like Apple's Max laptop lineup.
So there's something they're doing pretty differently.
That said 8->16 GB should be more like $50, not $200.