Ok, so... I feel a bit awkward, because after all this time and so many posts, I still can't find the key for the badges' colour change, nor have we truly stated it. Being in the low numbers, (less than 9000 subtitles yet ), I'm afraid I'll need some help from you all. Let's see if we can complete it:
Up to 300: White
100000: Pink? Yellow?
500000: Golden with stars?
According to mag11 and scircus in previous posts, there are two different pinks for 50000 and 100000. Is that certain, then? Because for such a huge increase, one would definitely expect a very distinctive colour... like a humongous badget framed in neon colours ha ha ha!