This sounds very high school but I joined a new team for this season because most of my friends did. I don't take racing too seriously so I like to ride/go to races with people I enjoy spending time with. We represent a local shop, get some free stuff, do team and non team rides together. It's a good deal. A lot of the guys are Cat 3 and I like to race in men's races too so I'd have teammates.
There's a new local elite women's team here, I was tempted to join but then remembered I have 2 kids, a dog, a job, house etc and leaving for days at a time to race out of state is out of the question