Christina was still quite a big star at the time so I would have thought both albums would sell well. Was it that her fans did not like the direction of those albums or was it wrong single choices and little promo?
Bionic lacked memorable music, nothing on it would've been a hit. As for Lotus, she wasn't really in shape. Your Body leaked 25 days prior to the release day and her label did nothing. She quit promoting the album after it was released and she snubbed the 2nd single Just a Fool giving it no video.