Cloud wasn't really a name and both fighters were coming off of poor performances. BHop vs Dawson I and II were not good showings from Hopkins(or Dawson for that matter) and the Cloud/Campillo fight was one of the worst decisions of 2012 as well as fully exposing how limited Cloud is as a fighter(though he was still a decent champion within his limits).
In all honesty, I didn't think the promotion for Hopkins-Cloud was very good. Word of the fight definitely could've gotten out better.
1.2 is average for HBO. 1.8 is considered a big success, remember that this is a premium channel with 'only' 30 million subscribers. Showtime which has slightly less subscribers would consider 1.2 million a home run for their channel. Game of Thrones which is a massive success for HBO averages around 3 million.