It's even worst for U.s players as we play during night time which only about~10 players online.
You could do something to fix that...
If you want to increase the effectiveness of them then you could ask for permission to glue those to walls in public and then cover them with "
It's Okay To Be White" posters that are held in place with a piece of duct tape, so that when those posters are removed, then the Emps-World ads are revealed, which means that people would be curious enough to look at them as they most likely wouldn't have expected there to be a different poster behind them. Considering that It's Okay To Be White is the new cool thing then it might even get some media attention to Emps ads or have people share pictures of them on social media.
As for the referral system, one was suggested a while ago, I stand by my position that it would be nice to have it and that we could avoid needing to worry about people cheating to get rewards from it by making it give 6 member days to the referrer whenever a member ticket is used. Should be simple enough to add, could be beneficial to players that use it properly, while being pretty much worthless for cheaters.