Since most people on this site have children in college or high school, I think that having a good agent when you are drafted is important. Baseball America lists the players who have signed and who their agent is, and how much the player received.
Scott Boras clients:
2000: Jason Young 2nd round--$2.750 million
Xavier Nady 2nd round--$1.1 +
major league contract.
Bobby Hill 2nd round--$1.3 million
2001: Tag Bozied--Senior drafted in 3rd round
$700 thousand
Mike Gosling--2nd round $2 million
Mark Teixeira--1st round $4.50 million
bonus with a ML contract that doubles it
2002: Jeremy Guthrie 1st round #22 $3 million
Vince Sinisi 2nd round $2.070 million
All the players above far exceeded the bonus amounts of the players taken around them in the draft, in some cases more than doubling the bonus amounts of the other players. He has his own staff of scouts and also sees the players himself. Being a good judge of talent and understanding a players real value is a talent that he has.