Well, yes. 90+% of the players who play college sports know they won't make it into the pros. It just isn't realistic. Alot of them play it to get them through college and because they do love it. The other few play it because they have the chance to go pro, and thus are going to work their ass off and play hard and fast to prove themselves to any potential pro team. Either way, they're playing hard and keep the games exciting.