i dont know much about how an artist work to say they would welcome genAI for such efforts

but for boardgame costs, im doubtful because much of the price comes from the logistics of manufacturing, storing, shipping and markup compared to the art. games like Horseless Carriage (the design is intentional) and the above mentioned Kanban EV both great games in their own right (about $100 each), employ one artist for the project and cost more than the entire base set (252 cards) of un-randomized distributed model cardgame ($40 at release) featuring artwork from around a hundred artists (unlike many commonly known randomized CCG blind bags, for this one you know the exact cards you will get in all releases)