There are so many program that give our scholarships to walk-ons that don't play or never play at all.  Many players at Alabama, OSU, etc often give our scholarships to kids who have walked on for 3 years and reward them in their 4th year even though they will barely contribute.  

It's called setting a precedence.  By rewarding these kind of great kids, they work hard and it rewards kids on the scout team.  That way the scout team can attract more quality players.