Also, looks as if BradM is another lawyer, haha.
Saying people won't use XP because they built their computer and there are licensing issues is BS. They're stealing 98 if they are jamming it on another machine, I find it hard to believe they feel it's wrong to steal XP as well.
Also, sure, assuming those 7% of HL machines could run Doom 3, the added cost of catering development to them would likely void the added revenues of the sales to them.