"I think possibly the most common reason is that I.E. is what is installed with Windows, and that MANY programs & sites specify IE as default when updating...etc. So many folks simply do NOT like installing anything or peeking "under the hood".
"

Not the case with me Bill.

I don't see what you are driving at. If you like a particular browser, then stick with. That doesn't mean anybody else has to follow suit. I wish people would leave normal grown up people to decide what's best for them.