Being a fan gives you all sorts of benefits for your career – gaining skills while having fun, networking with interesting people, traveling to places that may be good to relocate too. I, as is obvious, am big on Leveraged Geekery to benefit one's career and life.
It's too easy to focus on "obvious" things like, well, the above. But there's one less obvious – but very important – thing fandom does for you.
It teaches you new, useful habits habits – habits that may be good on your career or indeed to improve your whole life. Yes, in short, fandom may be making you a better person.
You just may not be aware of it.