TG, I liked your advice--that's the same thing I've taught my son since about 9 years old: "If the batter gets HBP it's the batter's fault--he had enough time to get out of the way, but chose not to".
On the other hand, that DH-Hitter thing looks kind of cool for practice work but I wouldn't spend $300 for it--I can draw a little, I own a sabre-saw, and I think I'll go shopping for some 3/4" plywood. I don't really care if mine is not made of "space-age plastic"--prehistoric wood is good enough for us.