They will make big money because of their following, which they totally deserve it. They had put in lots of hard work and time to build that.
Personally, I'm excited for the big names to come in because they will also bring in their followers, and that means the Steemit community is gonna be big. The big names may not blog as often because they have other platforms to tend to, so their followers will tend to look around the platform, and they may find you!