In the past, even if you were drafted in the 50th round, the thought was you would be "crazy to turn down the opportunity".
Now, what has happened is you started seeing guys like Mark Prior get drafted late in the first round and then go to college for three years, and then become the first pick in the draft and end up with more money. Plus, you go to college, you still have leverage to sign even after three years.
Moneyball also changed the way teams drafted- at least for a little while. One thing I think MLB has learned- most American born MLB players play college baseball first. So, they've started to draft more and more college players higher, which has of course, pushed a lot of high school players lower, which has caused them to go to college.
Nowadays, you have to be an elite high school player, be a legit five tool player or have absolutely electric stuff, and you have to be signable to get drafted high.
We did lose Corey Dickerson last year- but, we signed our other five players that got drafted. Including Hunter Renfroe. That's actually become pretty typical for college teams. So, odds are pretty good that even if you recruit a high school prospect that is a draft prospect, odds are still pretty good that you will get that player unless they are a top 10 round type pick. And even then, there is still a chance.
Polk didn't get that, or he didn't want to fool with players that got drafted. Because back in the day, we would have been lucky to get half of those guys that got drafted. Polk decided it would be better to not waste time on a lot of those players unless they promised to not go in the draft- like Ed Easley and Mitch Moreland. I know Easley withdrew his name from the draft out of high school- not sure about Moreland, but he wasn't drafted out of high school. Of course, the problem was, everyone else was getting draftable talent and we were getting left behind. That includes Vandy, South Carolina, and Florida.
I really think that, Polk's insistence on recruiting out of the baseball camp and Russ McNickle destroying our pitching staff is what got us in the situation that we are in now. Heck, we're still trying to rebuild our pitching staff as it is. That's why we have zero senior pitchers and only four juniors.