Do you have bounty campaigns? It would help you grow your advertising and promoting you site in the community. Like for example having signature campaign to help promote you site in a most effective way in this forum.
This can be one of the good reason to boost the marketing but you can see the picture up there that without bounty campaigns there is around 400 players online playing so it is really success as I can say. Because not all site can afford to spend this amount of money to do the bounty campaign, it seems like very simple but instead this is indeed a big sum of money that you need to put on to increase players. Instead of doing the campaign, nowadays most of them only holding events to attract players to play