The Intel A770 is currently $230 and 48GB of GDDR6 is only like a hundred bucks, so what people really want is to combine these things and pay $350 for that GPU with 48GB of memory. Heck, even double that price would have people lining up.

Apple will sell you a machine with 48GB of memory for thousands of dollars but plenty of people can't afford that, and even then the GPU is soldered so you can't just put four of them in one machine to get more performance and memory. The top end 40-core M4 GPUs only have performance comparable to a single A770, which is itself not even that fast of a discrete GPU.