I look at sales and I do not see big differences with the rest of the movies.
Wasn't Superman Doomsday the most top seller?
Did the Damien Batman movies minus the JL and TT, make money at all?
I'm betting the Gaslight and Harley movies underperformed.
I know Batman is their money maker BUT they will get more when they put him with the JL instead of him being solo in a movie.