Computer illiterate people who buy a PC and just use it will be using IE. They make up a large sum of that I'd guess.
Amen. These kinds of people don't even know what a web browser is, they just think that IE is the internet lol.
On a larger scale, it is the same reason that so many people use Windows, because that is what comes pre-installed and they are ignorant of anything better! Those that see the light buy Macs and use Safari and lead a much more satisfying and hassle free life
A person is smart, people are stupid!