The only reason I still log in and hang out more than once a week at all is
1) Savage
2) Want to meet up with friends and just...hang out, I guess? Do some maps? Help each other with Khloe journals? Admittedly the game is more just a thing to do with our hands and feel like we're interacting together while just hanging out in voice chat talking about our days.

If I didn't have either of those? Yeah, I don't know what reason there is to log in more than once a week at most.