To sum up Ninninger's sales, here's a trend of Sentai sales in the 2000's (my gosh, look what corporate America's done to me).

As seen, if you exclude Gekiranger, Ninninger will be Sentai's lowest selling season since Timeranger all the way back in 2000.

I'm sure Bandai of America will note this, to make sure Ninja Steel sells better. Luckily for them, they'll be able to market the Movie toyline alongside it, to help make up for any revenue Ninja Steel may fail to bring in.

Credit: http://www.rangercrew.com/forum/showthread.php?31371-Shuriken-Sentai-Ninninger-Discussion-Thread-II/page107