How much does that really happen? maybe you move up a few spots yada yada yada. But it's not like trying to throw a whole season, baseball is also very different. You don't have a fringe top prospect in the NFL AAA team down in Worcester that may or may not be able to be a starter next year. You need to figure those things out and being able to do so is very important. Playing a guy like Abreu, or Rafaela a few times a week is very very very different than "we want to lose, how do we play the game today so we definitely lose" I don't think the former happens in baseball.
Lets say the Sox brought up Drohan, and Gonzelez, and played Rafaela and Abreu and they went on a TEAR in september and missed the playoffs by one game.
NO ONE is sitting around thinking "omg no, we didn't get a top ten pick" rather you're excited for next year.
Now, lets take another sport, like the NBA. You have no shot at the championship but you play your heart out to a .500 record. How content are you? how great do you feel about the future?
Player development is so much different in baseball, you don't HAVE to have top ten picks every year to have a top farm system or even get a MVP caliber player. I just do not believe that any team, with malice and intent purposely try to lose a large sum of games during the year.