On the other hand they can put extreme margins for high-end hardware. So one high end device might be more profitable than 100 low end devices.

Just have a look at the 10-Ks. Nvidia's: "Gross margin for fiscal year 2019was 61.2%, compared with 59.9% a year earlier, which reflects our continued shift toward higher-value platforms". Datacentre is their biggest growth area today, and they have traditionally created specific high-margin products to extract value in areas with very limited competition.

The same thing is true for Intel when they don't have competition. They are the company they are today due to insane gross margin on Xeon and the explosive growth of cloud computing. DCG has been Intel's top performing BU for ages until recently. Expect the same story from AMD as it eats Intel's lunch in that market. High margin semiconductors are money making machines.