AM
It's a combination of a lot of things imo. First she didn't promote her first single or album at all. She didn't even start promoting her album until after the release and it was just performances on the voice mostly. I really felt like she didn't care about this album/single at all and that's what made me not care to buy the album or single.

Also as terrible as this is to say I can't deny that people do look at image and anytime someone talks about Christina it's a fat joke. The general public just is not into her anymore and that's her own fault especially when she made comments about Bionic in recent interviews.