Well, there's only so many monospace fonts that are beautiful,reasonably unicode-complete, easy on the eyes, programming-friendly AND
free (-ish).
Also, the default for the most popular terminal emulators
on Linux (e.g. xterm, rxvt) is actually a bitmap font.
Controversial topic there, tread carefully ;) . Lots of folks are borderlinemilitant when it comes to their terminal fonts, whether they're
bitmapped or not.
Also, white-on-black vs. black-on-white seems to be an
emotionally-charged question.