This isn't due to fundamental cost increasing per transistor though, this is because NVidia changed their pricing strategy to decouple it from that.
They are simply making greater % profit/transitor.
They are simply making greater % profit/transitor.
Because neither AMD nor Intel can come withing striking distance of Nvidia's flagships, and seeing how their silicone flies off the shelves, they have also adjusted their pricing to match their relative performance to Nvidia.
The top GPU is the 3060, at 4.89% which both Intel and AMD match with their offerings [1]
The top AMD dGPU is still the RX 580 at 0.97%
[0] https://store.steampowered.com/hwsurvey/Steam-Hardware-Softw...