No, it’s not about politics. Or global warming. Or economic doom. Or the war in Iraq.
No, it’s about the fact that from this list, which we can assume is reasonably cannonical, we learn that Creed have sold more records than The Police, Jimi Hendrix, the Beach Boys, or the Who.
Seriously, though, this chart would be more interesting if there were also columns for sales per year of activity and sales per album released, and then adjust both those for marketing dollars spent.