HS--Odd that kids with high GPAs and SATs choose to attend, given relatively low admissions standards, all-boys reality of the campus, and fact that it is in a very quiet part of VA (Farmville, along with Longwood). There must be something to the tradition, the post-graduation network, or the quality of the education that attracts students with credentials that would get them into much better schools. HS is always ranked high in U.S. News and the like, yet GPA and SAT numbers would suggest a much lower level student, academically, than they often get.
HS baseball--it's Div III. You have to choose at some point in your life--baseball and all the time and energy it takes, or something else (focus on academics, a job, an intership during the spring, study abroad, a relationship)? We all make the "something else" choice at some time, and it is worth asking whether playing at the Div III level outweighs what you give up in terms of working towards your future. Certainly, if you want baseball to be a part of that future, then by all means, stick with it at the highest possible level. If not, then think about when you hang up the spikes and concentrate on life after baseball.
BIV--my son attended and we know of dozens of others who attended. It was hit and miss. My son had some good college coaches (Div III) provide good instruction and guidance. Lots of PT. Other kids had HS coaches who seemed to care less about helping the kids. There were some fools, as well, screaming at the kids like they were Bear Bryant when he was still at A&M. What nuts. Great for kids interested in HS. Great for kids who get the luck of the draw and have good experiences. Terrible for kids who get the short straws.