They say be honest or say nothing at all.
I am the last person to forward advice on your question.
What I did, and still do every now and then is to go back in draft history, including periods before the great influence showcases, events, and lists have had, and also afterwards.
I will pick a few players in various rounds, track them a little(baseballcube), especially the ones right out of high school to see what they have done, a sort of "where are they now" excercise.
Many, many, many are done with baseball. A select few have made it big, some still trying to do so. Many early rounders are through while some selected later are working toward their dream.
This isn't the college vs. pro thread, but it applies some when you are asked a question from MLB about signing round or signing dollars.
There is a value to being an 18 year old on a college campus with people your own age, being on a college team, working toward a goal of maybe a conference ring, post-season play, and your Divisional version of a National Title.
There is a value in the college baseball venue that allows for personal and physical growth, exposure to the ranks, opportunity to get better, and also another opportunity to get drafted as a more mature individual. It is also a venue that can determine the other side of the coin, that being the baseball talent has reached its peak.
Arbitrarily speaking, if all Divisions annually had a total of 15,000 draft eligible Juniors and Seniors, and 600 or so are selected each year, 96% are not drafted. Those numbers aren't accurate, but give an example of the small amount that advance.
20dad is correct. Each case is different, each kid is different, each pre-draft scenario is different, some even perplexing
Terms like "value" and "investment" to me are pretty important. I believe, and I have to hang onto my belief that at some time, a player who deserves a shot will get it based on the field of play. From a general standpoint, not a personal one, I base this on what I started this post with.
HISTORY, and of course talent, whether discovered already or not quite convincing yet!