Looks cooler, and you tell yourself that you're saving your eyes as you sit in your blackout-curtained hacker den... but the pitch black hacker den is also part of the desired aesthetic.
Real Hackers didn't use rgb dweeb keyboards though
Oh, I see. In my day we smoked cigarettes, compared with which RGB keyboards seem like a pretty clean win. Literally a clean win; the main reason for keeping the lights off and the windows covered, as I recall it, was to hide all the filth that constantly accumulates in such an environment. Not to say I don't look back on it fondly, but when I actually look back on the photos I still have of how I lived then, it sort of makes my teeth itch, if you know what I mean.
Real Hackers didn't use rgb dweeb keyboards though