
I can answer this! The reason only certain colours are in use is to create a system of order. The reason premiums all have the same glow colour is to
prevent confusion by new and even not so new members who would undoubtedly freak out if they saw a rainbow of glow colours. Also, from a design standpoint from what I remember is that it looks a bit tacky when there are so many variations of colours and the Admins don't want that. It's either all the premiums have the same colour, or no colour at all... At least that is my understanding. Back when it first came out, there was only yellow glow and a star and then the old premiums wanted no star; then some wanted no glow, then some wanted purple instead of yellow, then some wanted more symbols than just the star, and well now here we are... It's already a little bit discombobulated already but I do understand the desire for a different colour. Maybe we can get the colour changed once more as a whole and have it change once a year or something.
Btw, there is a premium questions and suggestions for these types of threads... And you can link
Zise &
Lawliet to it if you think they won't or haven't seen it, donutbayo.