I joined for a couple of reasons. I'm a second degree nurse and in my first degree my academics were....subpar, to put it nicely. I was proud of my performance in nursing school, and wanted to have that recognition of being part of STTI. I also joined because you can let your active membership lapse and pick it up again at a later date- you're always an inactive member once you initially join.
I've been a little disappointed with my chapter's inactivity, (no meetings, no projects, no contact) but I anticipate there will be things I can gain from being a member as my career progresses. I'm not sure if it was a factor in my initial job search
as a new grad- I think my ENA membership was much more helpful and useful, and THAT I keep active.
I think it depends on what you envision your nursing future to hold. Even if it's not useful NOW, will it be useful in the future for you?