Since nobody else has responded I will let you know this question was posed at least once before and I don't think anybody had/gave an answer then either.
When this came up before, I remember reading on a NC State site it was posted by someone that Sam retired from baseball to pursue his career. I forget what he graduated in but I'm assuming it's to do something with his degree.
Who knows how factual as I can't find it now. Anyway, it was a response to an NC State baseball fan that asked why it didn't work out...