May be because there are so many people they feel they have to include in the main event picture in the first place. There are like 10 people who are legitimate contenders for the title. Instead of just picking a couple of them and pushing them and allowing the others to fall back a little and using them to give some credibility to the less established guys, they try and keep to many in the picture at once and there is just no way to juggle all those people at one time.