A couple things come into play with exposure type tournaments. Yes, most allow free substitution and you can bat everyone. This allows most teams to shuffle kids in and out easily. The team my DD plays for bats every girl and tries to get the girls in at least half the defensive outs a game. One of my observations of exposure tournaments is that the top teams get the better fields and schedule preferences. They also draw the college coaches to their games for obvious reasons. If you are considered a lesser team, they seem to play slightly different during their games. A lot of those teams are trying to make a name for themselves. They play their best players full games and play to win. Perhaps they feel like beating a traditionally good team in a showcase proves they belong. I am not sure what the right answer is. I always want my DD's team to play well, but don't really look at wins or losses. Other teams keep score and like to say they went 5-0 on the weekend. Reality is your DD needs to make the most of whatever playing time she gets. You never know when the ball is going to be hit to her and who will see it. Make the most of every situation.
I've see this too. We have a local Gold team that carries 20 players and plays 9. My DD's Gold team has a rule that if your not committed and don't send emails to college coaches with field info and game times the player sits. Also, hustle and attitude have to be good to get playing time. Coach told us that each player is good enough to be on his team or he wouldn't have picked her up, therefore every one will play in Showcase tournaments. It is different in actual tournaments, the best play.