Just saw this and had to chime in - the Uncommitted Showcase has a special place in our hearts - it resulted in my son getting an opportunity to play D1 baseball, but as mentioned above, not surprisingly, there was certainly a lot of luck involved.
Here's our story in a nutshell: My son was hurt during his Junior year and chose not to do any showcases unless and until he was confident he had fully recovered. He had a very good Senior season leading his team to a section championship, so he was finally ready to attend a showcase (a bit late in the process). The Uncommitted Showcase was held in June just after the section playoffs were over. Our plan was to go to the showcase and use the PG rating as both a reality check (how did son compare to other skilled players?) and, assuming the rating was good, as a last minute tool to help promote our son in his search for a program in need of pitching.
It didn't quite work out that way. Instead there was a head coach of a D1 program in attendance at the showcase who saw and liked my son and had a need that matched. Who knows what would have happened if all those stars didn't line up - but we're just happy they did.
Maybe the original plan would have worked too, but who knows.
Bottom line - my son got lucky, but that luck wouldn't have happened if he didn't put himself out there. My advice - get as much exposure as your budget will allow - you just never know when the stars are going to line up and that unexpected opportunity will come your son's way. Best wishes.