The MMO Tourist term is a pretty much known one among MMO players. For those who never heard of it, the idea of the term is to describe those players that left the game but come back for a few weeks (or months) once a MMO receives some new content. Then once they see anything that might pique their interest they leave just as quickly as they came back.
I am starting to feel my behavior with Monster Hunter World mimics that even though it hasn't had any substantial update for a while. In my case it is more when an event is announced. I get back into the game with the full intention of checking the event out, and finally finishing the base game's story, only for a few days later to completely forget about it and then play something else.
I think there are a couple of reasons for that.