People saying "that's a few?

"
Considering the circumstances, yes it is. Turn on the radio, you're gonna hear a Katy song each hour. Turn on an award show, Katy's there performing. Watch your favorite show and you're gonna see a Walmart commercial for Prism while Roar plays.
She has had non stop promo for all her eras plus a movie. It just ain't adding up to album sales.