This isn't a bad idea.
Site Mods should have green text to fit the green M next to their username, same with Devs(but purple)
But this will most likely be another Pro or Pro Basic thing
How cool would it be to unlock "colored text", at 1m points (so that it doesn't become overused), you could unlock a blue font, so on your comments, you have blue text instead of white text, to catch everyone's attention, or if you are on the weekly leaderboard, you could get yellow font to let people know that you're on the weekly leaderboard?