BigHit
The mental side of a player comes into play, certainly. But your numbers re: hs players in the first 5 rounds may be because:
Generally, hs pitchers are considered a big risk, aren't they? Many teams are looking more and more at college players because they are more developed physically and mentally, their college stats may be easier to translate into future production and they have played better competition and had better instruction while getting national exposure.
Can you determine what a player's ceiling is or the chance of becoming an impact player from watching hs competition?
Where do scouts make the most mistakes do you think? Do you think successful college players have a better chance across the board to be successful pro players than successful hs players?