It’s seems like they went all in on AMD a few years ago, so I assume they have a bunch of long term agreements that lower the price?
It’s more irksome to me that they don’t have a high spec non-pro desktop.
Eg I want high end consumer desktop GPUs, not high end mobile GPUs (afaict that’s essentially what iMacs use). But my alternative appears to be “pro” GPUs with their absurd - for a consumer at least - markups and Xeons, which no one really wants ;)