We have several genres of films in the past which scored super hits and blockbusters at the box office. Comparatively, historical or period films have less success rate than others. There are some more films which are treated as folklore entertainers, but due to too many characterizations, they appear like period or historical films.
Since filmmakers give too much importance to build up characterizations in period films, conversations among various characters offer boredom to the audience.
Since present day audience have accustomed to watch movies with racy screen plays, they may not like to watch period entertainers with slow narrations. But then, it is their responsibility to watch such films else, no filmmaker dares to produce period films in future. That's why, some of the channels also give good publicity to some period and historical entertainers in spite of knowing the fact that those films have boring content.