bballman,
Yes there are good players that go undrafted. My son went undrafted after doing well in a top conference. He signed a s a free agent.
I just don't think it is as easy as many think to just plug in kids. I think your underestimating some of the talent in the lower levels.
It is hard in the minor leagues, it takes more than most know even when there is a lot of talent.
I am not trying to be disrespectful to you but many parents think players are good, and they may be good, but they may not be good enough.