As Erik's harped on, there's a ton of risk in the MLB draft, even with first round picks. That risk is magnified for high school pitchers. The video beyond the link is two minutes of high school pitching prospect analysis, complete with video footage.

Watching these kids pitch and the hitters they're facing, it becomes obvious why you can't count on any high school player to be a major leaguer. It's high school. I'm not big into scouting, but I really enjoyed this video, if just for the perspective of what we're actually talking about with young prospects and draft picks.