system
A chat on subreddit /r/pcmasterrace
human
It's supposed to be the most expensive part. The more wafer area it needs the more expensive. Even small improvements can make a big difference in yield per wafer.
gpt
Doesn't die size scale with the nm process though? So at the same die size a lower nm process will yield a more powerful chip.  


I think the graph should also include TFLOPS to give an idea of generational performance increase for more context.. however even with this in mind we're probably still getting taken advantage of.