I think people get confused and believe DIII recruiting and DI recruiting are similar.
You could send a video, bio, whatever you want to a DI coach and at best you might interest him. In that case, he most likely will want to see you perform.
You can pick out most any 10 DIII colleges and simply send them a message along with your academic information saying that you are interested in playing baseball at their college. You will hear back from several of them. No showcase, no video, no camp, required. The only DIII colleges that will possibly ignore your interest are those among the very best baseball programs and those colleges not looking for additional students. Of course, none of this means you will be a starter, dress for games or even be on the team.
The obvious difference is the investment made to recruits. There are many DIII colleges that recruit based on student enrollment first, baseball ability is secondary. Most all of them want the best possible players, but they can't get enough of those players. They get as many as they can, but they do need a full roster of enrolled students. That is the only way baseball exists at many small colleges.
So comparing DI to DIII recruiting really doesn't make sense. It is similar to comparing those drafted with those that go undrafted. In no way am I downgrading DIII baseball. I actually coached many years at small colleges. We recruited hard, but half our roster was made up of kids that just wanted to play baseball and attend our college. Kids we didn't try to recruit. Every so often one or two would actually work their way into a starting position. Some sat on the bench for four years.
I suppose this post could be taken the wrong way. I just think it is important that people understand there are many small colleges that will be interested in you. All you have to do is show interest in those colleges. Yes, I am talking about some great academic colleges also. This is definitely a situation where grades are more important than baseball ability. In the end, the best players get the playing time, just like it is most everywhere else.