One thing you seem to have forgotten to mention is what about those who use linux as a server or a network hub (such as myself) and run windows for different reasons (graphic design, web dev, whatever). I hop on F.M. lookin for different tools to update on my linux box, and most of the time its from windows just because i'm lazy like that.
Just because someone uses I.E. to surf F.M. dosn't mean they are anti-linux or anti-netscape.
What about those who only have the choice of I.E. at school or work, and are bored so they look for things to download when they get home.
Honestly, I think a large percent of the population are linux lovers, and do infect use netscape, it's just the logs can't tell you from where (work, school, home) or why (bordom, interest, emergency upgrades, etc) they are surfing the site.