There is the money aspect to consider, if a high school player is drafted in the early rounds, they can sign for more money then most people earn in half a lifetime. For the lower rounds, no doubt college is better IMO. You have to realize Milb isn't just American kids, they also bring in many from Latin America, just read the book "Odd Man Out". Yes the book has been questioned, but most of what is written is too realistic to have been contrived. If you ask me, the odds of just getting to Milb is even lower now than before with all the foreign born players being recruited. Just look at any MLB roster, the Mariners for instance, the team is half foreigners. Of course these players are no doubt talented, but baseball being a business you get these guys for less $$$.