After the September roster expansion, MLB teams become diluted. You no longer have the best of the best facing against each other. Young players are brought up to get seasoning and Four-A players are also given time so teams can rest their stars (especially if a team is out of the playoff race).
If you play fantasy baseball, you’re always looking for an edge. Some of these players are going to look great, because they are facing sub-standard pitching/hitting every couple days.
I will show you some examples and explain to you why I am either buying or selling their stats so far in September.