Have you ever highlighted a page randomly to see if any grey text in someone's sig appears? You'd be surprised about what you'll find...
It used to say "take your pants off" in my sig in white text, when we still all used the white skin (or maybe you all still do, idk). o: I forgot about it for a while until someone pointed it out to me. xD
Sometimes, although the dim grey text can still be seen on the dim grey background. Mine never needs that to be done. :B
That's only if you don't do it properly. You have to actually put the hex code in there, not just choose a close gray from the little color dropdown thing. :d
Not paranoia; curiosity. And you could've made better use of this opportunity. I'm disappointed in you.