I don't have time to look up all the data because I'm about to spend my Christmas Eve, eve going ice fishing. What I'm saying is that these players still hold value, whether or not they ever make the majors. That value could be used to acquire a more established talent. The player could become a major league player himself, or he could end a bust (as you're implying, but under the notion that they only have four years to do so).
Merry Christmas Dogg you must easily hold the BJMB record for first poster on ignore per user. You just gained +1 today.