In comparison, Beavercreek Fall Ball is $50 per player (or at least has been in the past few years) and teams play in what they wear (sort of provide your own uniform). If you can get all the girls in one color shirt you're usually lucky.
Let's see, 12 girls @ $50 each seems to me like that's pretty close to $600 for a team....
In fact, if your team has 13 players, you'll actually get a break at Miamisburg.
In Beavercreek you can enter as an entire team or as an individual and they will organize a team for you (with 2 pitchers, 2 catchers and at least one player for each other position). Sounds like maybe Miamisburg is looking for complete teams to sign up.
Good luck to everyone who plays fall ball.