Hey,
how about if Premium players would have a different avatar than ussual - e.g. the green dot showing that player is online could be golden, or the name could have a different colour.
This would make it easier to know who of your friends is Premium (don't need to explain the benefits of that I presume) and directly ask them for a favour instead of having to go to chats and ask around all the time.
(sorry if that was already discussed before- can't say that i have read all the threads since the begining of time )