Some guys go the JuCo route for grade issues. Others start out as high profile recruits and lose some thunder during the year (due to injury or whatnot) and go JuCo to try and get some of the offers they were hearing at first back (even though the elite programs avoid JuCos when possible).
We have our share of JuCo success. Tim Rattay went that route. Matt Combs played JuCo ball before starting for us last season. Even players like Haskins, McDowell, McKenzie, and Disy (who were good players for us).