Reason #3 to Leave: The lifetime of losing
This is the part that many a pissed off fan puts their hat on. The Mariners have been bad, and they've been bad for a long time. All the playoff berths (before the 2022 one) came between 1995 and 2001. Nothing from 1977 to 1994, and then nothing again from 2002 to 2021. To see two stretches equalling nearly 40 years without going to the playoffs is terrible.
I know this frusturates a lot of the older fans who remember those teams from the 80s. Those around my age who grew up with the playoff Mariners (who were born somewhere around late 80s) don't have it near as bad because we got to see a great stretch as we grew into our fandom.
Then you have the younger generation, who went their entire fandom without ever seeing the playoffs. There are people who have written for this site, or still do, that were in diapers back in 2001... if they were even around yet. 2022 was their first time ever seeing the playoffs. That can be hard to handle.
Add in the fact that the team seems to never improve, and it's easy to lose hope.
However, notice that I said seem.