Reasons I'd add teams:
Better chance of getting a conference team in the playoffs if we're the clear #3 conference. Like daris said, it's more fun to watch college football playoffs if there is more of a connection with it.
I just like the look of the conference with UA, ASU, UU, CU better than without.
I've never understood blindly chasing money, but it's ultimately the name of the game here. And I'd rather kill than be killed.