As well as those you've mentioned, set and costume design, minatures and location filming, plus the huge marketing blitz that is expected to start in Summer.
Even with all of that stuff 65m and episode would be completely insane. They aren't paying Crowe 40m an episode for season 1 of a show.There was a rumour that Russell Crowe is to be involved in season one, so that could account for some of that money.