Re: Camaraderie and hanging out
I was in a band for a few years that had a very strange practice schedule, as it went right through the dinner hour on a thursday each week. We made it a point to go out for burritos together after practice, and it's amazing how much stuff we were able to get done with just that extra hour or so a week.
We were able to plan our future, talk about gigs, tours, recording....a bunch of stuff. And we did our best planning over burritos.
If you choose to take the next step and hang out socially with them, then great. If not, at least hanging out with them enough to get a good understanding of the types of individuals you're playing with would be a good thing. Some bands have no aspirations out of the occasional jam session, but that's likely not what we're talking about here.