Yeah, Apple's bottom barrel pricing isn't terrible, but as soon as you start upping specs the price goes out of control (disproportionally from the underlying costs.) Looking at pricing for the current Macbook Air, it's $400 to upgrade from 16GB to 32GB. A 16GB SODIMM costs ~$40 retail.
That $40 16GB SODIMM is significantly slower than the memory they use - even on the desktop side 16GB of comparable DDR costs twice as much, and that’s before you factor in the latency and bandwidth hit.
The problem is that there’s no alternative in the Mac world for people who don’t want the fastest option any more. Moving from the 16GB MacBook Air to the 32GB is a mandatory CPU/GPU upgrade and there’s no way to only buy one of the two if you don’t need the other.
> That $40 16GB SODIMM is significantly slower than the memory they use
No it isn't, Apple uses ordinary LPDDR5. The higher end models achieve higher bandwidth in the same way as HEDT PCs: By using more memory channels. The base M1 in that MacBook Air doesn't even do that, it has the same memory bandwidth as dual channel DDR5 PCs.