I work in CV and a lot of labs I've worked with use consumer cards for workstations. If you don't need the full 40+GB of VRAM you save a ton of money compared to the datacenter or workstation cards. A 4090 is approximately $1600 compared to $5000+ for an equivalently performing L40 (though with half the VRAM, obviously). The x090 series cards may be overpriced for gaming but they're actually excellent in terms of bang per buck in comparison to the alternatives for DL tasks.

AI has certainly produced revenue streams. Don't forget AI is not just generative AI. The computer vision in high end digital cameras is all deep learning based and gets people to buy the latest cameras, for an example.