Because college football and basketball are so prominent, when the best players move up to the pros they're already well-known.
However, baseball's different.
How many of you pretty good sports fans can tell me who won the baseball College World Series just a few weeks ago? Same with the players. Even the stars drafted highest are anonymous except to the real cognoscenti. And even then, whereas invariably the can't-miss prospects in other sports don't miss, hardly ever miss, in baseball nobody ever says: Can't miss. Fact is, the ones who miss too often are the scouts.