User blog comment:Callofduty4/Black Ops III Zombie reveal at SDCC/@comment-1263839-20150625205941/@comment-24756040-20150627183616

People uninterested with the Campaign won't invest in the DLC if it's separate. It'll just be effort wasted on the part of the developers, as a minority of the Call of Duty community will want it. As well, people will be less encouraged to purchase the DLC packs if they are included within the four big DLC's, which in turn, would make them, and the season pass, more expensive.

And besides, there's few people that really care for the big Zombies easter eggs nowadays. Unless explicitly stated that the easter egg will be done that game, nobody will do the easter egg in a typical Zombies lobby. The whole easter egg problem really doesn't effect me, as I don't have a desire to do the majority of them.