In reply to Liam.

thats the problem. katy is a singles artist, and her singles flopped. witness is an amazing album but the singles are katys biggest gain and because she poorly chose the singles her album flopped along with them. katy has never stayed in the number 1 spot on the billboard 200 for more than 1 week, because she is mainly based on singles. sadly she messed up not choosing roulette, witness, or hey hey hey as lead singles. bon appetit is what caused this album to flop.