Jon Heyman has an article up that is the closest thing we'll ever have to an official debate between Frank Coonelly, MLB senior VP who is responsible for the new draft rules that favor the teams, and Scott Boras. And, oddly enough, I found myself siding with Boras' reasoning.
Coonelly's point is that teams who pay too much for their draft picks usually regret it as only about 38% of the players drafted in the first 3 rounds make it to the MLB. Out of the players who are paid 5% more than the suggested slot price, only 40% are.
Boras counters with the numbers from just the first round, which he contends are the only people who should be making big money anyways because they're really the only ones with projectible talent. When you look at first round numbers, basically anyone who has gotten to more than 4 million has made it to the bigs (they list out all 9). And the number for people in the 1-3 million range are pretty good.
What does this have to do with the Rangers? It makes me much more comfortable with taking Porcello and his 10 million dollar signing demand. As long as he comes off this silly wanting to be on the MLB Roster nonsense. Check out the article, it's pretty convincing.