sweet feet, if you did not intend malice, I apologize.
I don't think you would "always" try out for more than one. In our age group, we have more and more players who are moving to other clubs or as they get older they decide to pursue other things. Our club may not have enough players to field a challenge team and is why we are trying out for two teams for the first time in six years.
In our area BFA is a great idea, but until all the clubs get together, you may have a team one year and not the next. There's also the kid that makes a premier team and may choose to play on another team because of playing time. There are high school coaches that are coaching club and can only have a certain # of the same players. You could be a better player but not make it because of the #'s rule and positions needed. Or making the club team with the high school coach could keep you from playing varsity until Junior year. Other issues are that clubs are not announcing until after tryouts who the coach will be, practice field locations and even which club will field the team.
I know some clubs are more united and organized than this and would not have these issues, which may be why these situations are not known to you.
Again, sorry, if I took it the wrong way.