OutinLF,
I'd like to tell you that any coach that does that (takes a kids out of a game knowing a scout is coming) should be called out for it. However, I realize that most players and parents will not call out the coach because they do not want to further jeopardize their situation or position. They are powerless against the coach, and he knows it. Essentially, it is mental bullying by the coach. Bullying is alive and well in HS baseball coaching.
There are many other incidents where a coach should be called out, but the players and parents do not want to call attention to it. Furthermore, there is little accountability between coaches and ADs, as most of them are buddies. The AD is almost always going to have the coaches back. Almost all coaches in our area refuse to deal with parents (unless it is to raise money for their program) on any regular basis. In some cases, I don't blame them for not wanting to deal with parents. Most parents don't know how to manage a game, and evaluate talent. Unless there is some level of impartial oversight, these coaches will continue in their ways. Absolute power corrupts absolutely.