Another Idea (I'm in the forums a lot)

Could there be an option for people where you receive an extra maybe 10k if you share an achievement on social media, and it could only work once.
I've seen them do this on other games and I don't see any disadvantages.
I think it would help to bring more players into the game

Doubt it would be worth them developing this. Better to have a nominate a friend scheme and if they buy premium, you get a bonus