Apple silicon.
It also requires more energy, which means larger batteries, which means more dollars.
>The new Mac processors will shave $75 to $150 off the cost of building a computer, estimate analysts, who say Apple can pass those savings on to customers and shareholders.
https://ark.intel.com/content/www/us/en/ark/products/196588/...
Apple could easily make that saving and more. You can also look at iPad Pro selling price as reference.
And their profit on Mac hardware is only 15-20%. You may price at double build costs, but there is still design, R&D, testing, sales, marketing, distribution, support, warranty costs and admin overhead to be accounted for.