Have been to USA/ASA the last 3 years with daughter, once she was 14U, the other two 16U. A solid representation at 14U, mostly assistants, but a lot of colleges. 16U was amazing, Mostly head coaches every where you looked from all the major conferences down. I remember one game there were 2-3 PAC 10 coaches, 3-4 Big 12 coaches and at least one SEC coach there to watch a pitcher and a catcher from Oklahoma who were playing my daughters team. That was cool. However I think it will be interesting to see how or if this is affected by the growth of Premiere and their nationals.
Also definitely agree with everything Sammy said, they are there to watch specific players who have been in contact with them, not just roaming around. They have a schedule of where they want to be and when.