Development costs are spread across all products as they all share the same architecture and this includes the lucrative data centre which just brought in around 10billion in 3 months
Nvidia net margin is currently up at 31%, from 16% at end of 2022.
Take the £1500 4090, knock of £300 for VAT and another £100 for distribution costs / retail margin.
31% of £1100 is £341 or 23% of the total selling price. That a big assumption on flat profit, when likely they make more % profit in AI and commercial and less in retail so likely less than 20% profit per card.
Using gross profit is ok and an indication of an items commercial viability but unless you add all the other cost for a business, it's meaningless.
They still have to pay to clean the floors, update drivers, AI time for DLSS for the next 10 years......
Yes GPU's could be less expensive, but not as much as people think.