It's not a song stopping people from buying the album, the single's job is to get people who wouldn't buy it anyway to buy it
The die-hards would buy an album no matter what
Casual Fans maybe or maybe not
The average person won't buy an album unless they like the singles
Advertisement could make people who wouldnt buy want to buy, and again, are they not playing at award/tv shows?, is that not getting the song out there?