thats an interesting chart, come to think of it my band most popular songs are the ones that are fairly not energetic, all of them have really loud parts though. Our biggest hit right now is also right around 90 bpm.
I don't think getting a hit song is up to the people. Whatever a label decides to pick and promote, is what gets played on the radio and on tv, and becomes a 'hit'. After that one song, everyone's gonna listen to the artist's other songs too.