well if there are 40k users, if 25% had supporter (which is generous) that would mean 10k*40 dollars. Which means 400k per year. To be honest that's not so much. Of course advertising is some kind of income, but you still have to pay the developers, and administering the servers takes it's toll. I think it's safe to say the game isn't making that much money. But still, if they could do some minor changes(which ones, that's the mystery) they could vastly improve financial aspects.