i mean, if you want to look at it that way, then you start needing to factor in how much time you need to invest in something to properly get the intended entertainment value out of it - which, even if you include prep time on the dm's part as part of the intended entertainment value (which some people definitely would), is still INFINITELY higher then almost any other medium just by virtue of having to schedule sessions with other people. having to just wait for the session time to come around. i can boot up a movie or video game whenever i want and just GO.
in short, they're very different mediums. i don't think they're easily comparable, and i think time per dollar is a very reductivist and not very useful metric to look at if it's the only thing you're looking at.
...unless you mean like. movies in theaters. then, yeah, fair enough.