Table46, welcome to the site, and thanks for posting about your experience, which seems to confirm that most recruiting is local. Is your son going to one of the schools you mentioned? Did you find that the PG showcases had an impact in his recruiting (meaning, did any coaches mention it)? They are just so expensive, and finding new ways to monetize every day.
In our experience, if you are interested in high academic schools nationally, Headfirst or Showball really work because coaches are there watching. Otherwise, stay local - school camps, state PBR, local showcases - or go to camps at targeted schools, as long as you have the skills to play there.