The only thing I know about Hoosier Diamond is that they use their showcases to recruit 16u players for a team that goes to the Junior Olympics in June. In 2005 and 2006, those teams were among the very least successful teams in Jupiter, FL.
I had an opportunity to speak with some of the parents who made that trip this past June. My understanding is that the coaches exact a pretty stiff participation fee for this and a lot of that fee goes to them as pay. The parents were able to see when they got there that they were not up to par, and especially short on pitching. They felt fleeced.
We played them and all I will say is, it was ugly.
I don't know what all else this program does, but this does not speak well of the program or the people running it.