we let everyone in, and have preseason trainings that help us weed out those who don't really want to do it... build season does that too, though
. while anyone can join, only those who give full commitment (determined either by hours, workload, or by our executive board when our hours tracking system failed) get financial assistance making it to competitions.
this year we had approx. 30 students, a disturbingly large amount of whom were seniors (we may need to start doing a bit more outreach... although my class (seniors) did always have a large amount of people in the club).