You really are prescient, or at least seem to know what is going on in our household. I don't think I mentioned on here some of our most recent questions.
My DDs organization went to one showcase out of state showcase, and one very local one this year. She is concerned that is not enough and I told her I would see about an individual showcase if necessary. She is 1st year 14u, so I we have some time before showcases. There are some other points you mentioned that are very relevant to us, but I can't get into that now.
One thing I can say very positively about my DDs organization is player retention. I asked the president of the organization about this before she even tried out. I was told they keep their players unless a girl is not putting in the effort and showing improvement. That was proven to be true after the tryouts in August.
In the past 8 years of college showcase tournaments, I've only had 6 college coaches come up to me and inquire about a player. 5 out of 6 of those times was after my DD had a great defensive game while behind the plate and hit a HR or 2 in the same game. The other was about my stud SS who hit a ton also,
Don't get wrong, I've had more than a few "discovered" at them but it was mainly due to their families doing the initial legwork. The overall national average is less than 1% of all SB players are "discovered" at team college showcase tournaments or even nationals. A majority of the players are found through the college camps, clinics and individual showcases and by the players and families contacting the college coaches of the colleges DD is possibly interested in attending.