Anyone developing for health-care, government, etc.
Heck, I'm sitting here on XP, developing specifically for IE6 and nothing else.
I hope you hate your job a bit :)
And I hope your rate is doubled, at least.
Although IE6 has it's share of problems, it's actually kind of simple developing for one single version of one browser. Once you get used to the quirks, they are constants.
(Note: I'm not saying I like it, just that it's become "normal")
I think he's just curious about how IE6 was tricked into supporting it.