Player Draft System - this is like for every american sport like Basketball, Baseball, American Football. Clubs picks out a player as 1st pick or so from an MLS Draft Pool. No Academy Football here in America. Most players are scouted from Universities and Colleges.

No Reserve Club System: No Club Academy system means no Reserves Team competition. No room to develop young players that will someday play in the first team. Freddy Adu was a notable victim of this, he was hyped as the one million dollar boy. But the lack of chances of playing in the 1st team, means he sits most of the time on the bench instead of playing like somewhere in Europe. Inter made a bid when he was just 14.

Salary Cap and Designated Player Rule: In order to keep cost of running a team. Clubs are limited to a salary cap on player's salary. There is an exception where in you bring in a famous footballer to play in the league (such as Beckham).