Hmm...there isn't a whole lot of team tactics during arace but there are a lot of things before and after the race that makes being on a team great...
-fun!
-travel logistics
-practices and group rides
-coaching and advice
-discounts from sponsors
-shared pit bikes and wheels
And don't be turned off about joining a team if all you have seen are the roadie teams looking all serious and the stuff. People who race 'cross are so much more inclusive, down to earth and laid back about the whole thing. I hear 'cross racers are much more like mountain bikers in that regard, but from what I understand, it's mostly the road racing clubs that field a 'cross team (like mine.)
So just ask around the shops. Chances are the staff race or know racers. Find teams with good vibes, attend a clinic or practice and meet the riders. You'll find that most of them want you to join in the fun with them. 'cross is such a fringe sport here that it's like a little brotherhood/sisterhood.