I think we agree, just define terms differently -- video games are art! In other words, gamers are consumers of artwork, and that consumer demand for a new kind of art drove demand for the hardware to go with it. (Naturally that wasn't the only source of demand - engineering and research applications were there from the beginning too).
Edit: this discussion is interesting because I have always just taken it for granted that video games are a form of art. Clearly others don't see it that way, which is fair! Nevertheless, I think a strong case can be made: https://en.wikipedia.org/wiki/Video_games_as_an_art_form