Good point, although note that console game rental was also a thing at the time, it is easy to share cartridges (just not playing at the same time), and I'd gue

Good point, although note that console game rental was also a thing at the time, it is easy to share cartridges (just not playing at the same time), and I'd guess there was a larger second hand market in console games as well. So there would also be more console game players than sales would indicate.